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Flashcards

ROCKKS

G. Gidluck Geology University English 109 cards

ROCKKS

Cards in this deck (109)

  1. 1—Biotite
    1 direction of cleavage*
    Distinguished from Muscovite only by colour*
    Vitreous lustre
    Common in both metamorphic Soft
    mineral (H = <2.5)
    •Can be scratched with fingernail    Biotite 1 direction of cleavage* Distinguished from Muscovite only by colour* Vitreous lustre Common in both metamorphic Soft mineral (H ...
  2. 2—3 directions of cleavage not at 90 to each other
    Reacts strongly with HCl
    Vitreous Lustre
    Common in Sedimentary rocks and Marble
    Soft mineral (H=3)    3 directions of cleavage not at 90 to each other Reacts strongly with HCl Vitreous Lustre Common in Sedimentary rocks and Marble Soft min...
  3. 3—Dolomite
    3 Directi    Dolomite 3 Directi
  4. 4—Galena
    3 Directions of Clevage at 90 to each other
    Bright Metallic lustre
    High density / specific gravity
    Soft mineral (H=<2.5)    Galena 3 Directions of Clevage at 90 to each other Bright Metallic lustre High density / specific gravity Soft mineral (H=&lt;2.5)
  5. 5—Garnet
    No cleavage
    Dodecahedral Habit
    Common in Metamorphic rocks
    Hard mineral (H=>6)    Garnet No cleavage Dodecahedral Habit Common in Metamorphic rocks Hard mineral (H=&gt;6)
  6. 6—Halite
    3 directions of cleavage at 90
    Translucent to transparent
    Tastes salty
    Common in Evaporate sedimentary rocks
    soft mineral (H=3)    Halite 3 directions of cleavage at 90 Translucent to transparent Tastes salty Common in Evaporate sedimentary rocks soft mineral (H=3)
  7. 7—Hematite
    No selvage
    metallic lustre — when unoxidized. Dull metallic otherwise
    Red-brown streak
    Weakly magnetic    Hematite No selvage metallic lustre — when unoxidized. Dull metallic otherwise Red-brown streak Weakly magnetic
  8. 8—Hornblende
    2 directions of cleavage not at 90 to each other
    Common in intermediate igneous rocks and metamorphic rocks
    Columnar habit
    hard mineral
    only really distinguishable from Pyroxene by habit    Hornblende 2 directions of cleavage not at 90 to each other Common in intermediate igneous rocks and metamorphic rocks Columnar habit har...
  9. 9—Alkali Feldspar
    2 directions of Cleavage at 90 to each other
    perthitic texture
    Common in high-grade metamorphic rocks, and felsic igneous rocks
    hard mineral (H=6)    Alkali Feldspar 2 directions of Cleavage at 90 to each other perthitic texture Common in high-grade metamorphic rocks, and felsic igneous...
  10. 10—Kyanite (my beloved)
    2 directions of cleavage not at 90
    Typically blue in colour
    common in metamorphic rocks
    Bladed habit
    Differential hardness (Long axis of mineral can be scratched by steel nail, short axis cannot)    Kyanite (my beloved) 2 directions of cleavage not at 90 Typically blue in colour common in metamorphic rocks Bladed habit Differential ha...
  11. 11—Muscovite
    1 direction of clevage
    Distinguished from biotite only by colour
    Vitreous lustre
    transparent
    common in both metamorphic and Felix igneous rocks
    soft mineral (H=<2.5)    Muscovite 1 direction of clevage Distinguished from biotite only by colour Vitreous lustre transparent common in both metamorphic and Fel...
  12. 12—Olivine
    No selvage
    Granular Habit — Looks like a bunch of sugar crystals fused together
    Common in magic igneous rocks
    typically apple-green colour
    Hard mineral (H=<6.5)    Olivine No selvage Granular Habit — Looks like a bunch of sugar crystals fused together Common in magic igneous rocks typically apple-gre...
  13. 13—Plagioclase
    2 directions of cleavage at 90 to each other
    twin striations
    common in igneous rocks and high grade metamorphic rocks
    hard mineral (H=6)    Plagioclase 2 directions of cleavage at 90 to each other twin striations common in igneous rocks and high grade metamorphic rocks hard mi...
  14. 14—Pyrite
    Dark-green streak
    Brassy-yellow (Brown if weathered)
    Blocky or Massive habit (Can form clusters of cubes)    Pyrite Dark-green streak Brassy-yellow (Brown if weathered) Blocky or Massive habit (Can form clusters of cubes)
  15. 15—Pyroxene
    2 directions of cleavage at 90 to each other
    Common in Magic Igneous rocks
    Blocky habit (Blocky usually distinguished from columnar by relative length of axis)
    Columnar A~B << c
    Blocky A~B <= C    Pyroxene 2 directions of cleavage at 90 to each other Common in Magic Igneous rocks Blocky habit (Blocky usually distinguished from colum...
  16. 16—Quartz
    No cleavage
    concoidal fracture
    Common in felsic igneous rocks, high grade metamorphic rocks and clastic sedimentary rocks
    Massive and/or prismatic habit    Quartz No cleavage concoidal fracture Common in felsic igneous rocks, high grade metamorphic rocks and clastic sedimentary rocks Massive ...
  17. 17—Calcite
    3 directions of cleavage not at 90 to each other
    reacts strongly with HCl
    Viteous lustre
    common in sedimentary rocks and marble
    Soft mineral (H=3)    Calcite 3 directions of cleavage not at 90 to each other reacts strongly with HCl Viteous lustre common in sedimentary rocks and marble S...
  18. 18—Dolomite
    3 directions of cleavage not at 90 to each other
    reacts weakly to HCL when powdered
    common in sedimentary rocks
    soft mineral (H=3)    Dolomite 3 directions of cleavage not at 90 to each other reacts weakly to HCL when powdered common in sedimentary rocks soft mineral (H=3)
  19. 19—Galena
    3 directions of cleavage at 90 to each other
    Bright metallic lustre
    high density
    soft mineral (H=<2.5)    Galena 3 directions of cleavage at 90 to each other Bright metallic lustre high density soft mineral (H=&lt;2.5)
  20. 20—Garnet
    No cleavage
    Dodecahedral habit
    Common in metamorphic rocks
    Hard mineral (H=>6)    Garnet No cleavage Dodecahedral habit Common in metamorphic rocks Hard mineral (H=&gt;6)
  21. 21—Halite
    3 directions of cleavage at 90 to each other
    Transparent to translucent
    tastes like salt
    Common in evaporate sedimentary rocks
    Soft mineral (H=3)    Halite 3 directions of cleavage at 90 to each other Transparent to translucent tastes like salt Common in evaporate sedimentary rocks Sof...
  22. 22—Hematite
    No cleavage
    Metallic lustre
    Red-brown streak
    Colour can be dark grey or red brown
    Weakly magnetic    Hematite No cleavage Metallic lustre Red-brown streak Colour can be dark grey or red brown Weakly magnetic
  23. 23—Hornblende
    2 directions of cleavage not at 90 to each other
    common in intermediate igneous rocks and metamorphic rock
    Columnar habit    Hornblende 2 directions of cleavage not at 90 to each other common in intermediate igneous rocks and metamorphic rock Columnar habit
  24. 24—Alkali Feldspar
    2 directions of cleavage at 90 to each other
    Perthitic texture
    common in high grade metamorphic rocks, clastic sedimentary rocks and felsic igneous rocks
    hard mineral (H=6)    Alkali Feldspar 2 directions of cleavage at 90 to each other Perthitic texture common in high grade metamorphic rocks, clastic sedimentar...
  25. 25—Kyanite
    2 directions of cleavage not at 90 to each other
    Typically blue in colour
    Common in metamorphic rocks
    bladed habit
    Differential hardness (H=5 and 7)    Kyanite 2 directions of cleavage not at 90 to each other Typically blue in colour Common in metamorphic rocks bladed habit Differential h...
  26. 26—Olivine
    No cleavage
    Granular Habit
    Common in magic igneous rocks
    Typically apple-green colour
    Hard mineral (H=>6.5)    Olivine No cleavage Granular Habit Common in magic igneous rocks Typically apple-green colour Hard mineral (H=&gt;6.5)
  27. 27—Plagioclase
    2 Directions of Cleavage at 90 to each other
    Twin striations
    Common Igneous rocks and high grade metamorphic rocks
    Hard mineral (H=6)    Plagioclase 2 Directions of Cleavage at 90 to each other Twin striations Common Igneous rocks and high grade metamorphic rocks Hard miner...
  28. 28—Pyrite
    Bright Metallic lustre
    Dark grey-green streak
    Brassy yellow (Brown if weathered)
    Blocky or massive habit (Blocky crystals)    Pyrite Bright Metallic lustre Dark grey-green streak Brassy yellow (Brown if weathered) Blocky or massive habit (Blocky crystals)
  29. 29—Pyroxene
    2 directions of cleavage at 90 to each other
    common in magic igneous rocks
    blocky habit
    Hard mineral (H=5-6)    Pyroxene 2 directions of cleavage at 90 to each other common in magic igneous rocks blocky habit Hard mineral (H=5-6)
  30. 30—Quartz
    No cleavage
    Concoidal fracture
    Common in felsic igneous rocks, high grade metamorphic rocks and clastic sedimentary rocks
    massive and/or prismatic habit
    Hard mineral    Quartz No cleavage Concoidal fracture Common in felsic igneous rocks, high grade metamorphic rocks and clastic sedimentary rocks massive ...
  31. 31—Fedspathic Arenite
    Texture: Medium grained, moderately sorted
    Pinkish colour of class are often feldspar grains
    Full name: Medium grained feldspathic arenite    Fedspathic Arenite Texture: Medium grained, moderately sorted Pinkish colour of class are often feldspar grains Full name: Medium grained...
  32. 32—Caorse-Grained Quartz Arenite
    >95% quartz grains
    Rock shows graded bedding structures as well    Caorse-Grained Quartz Arenite &gt;95% quartz grains Rock shows graded bedding structures as well
  33. 33—Medium Grained, Lithic Arenite
    50% lithic grains — other rocks fragments and minerals that are not feldspar or quartz
    Medium lower to medium upper grain sizes
    Yellow colour is the result of iron oxidation    Medium Grained, Lithic Arenite 50% lithic grains — other rocks fragments and minerals that are not feldspar or quartz Medium lower to med...
  34. 34—Mudstone
    Clay sized grains - very well sorted
    Very soft rock - easily scratched
    Easily mistaken for shale but mudstone has no fissility
    Can easily be mistaken for siltstone but clay grains are less gritty and no signs of bedding    Mudstone Clay sized grains - very well sorted Very soft rock - easily scratched Easily mistaken for shale but mudstone has no fissility C...
  35. 35—Pebble Breccia
    Very angular clasts — look at the outline of grain. Angular clasts define it from conglomerate
    Very mixed composition
    very immature rock (Grains have not traveled to be rounded by erosion)
    Very poorly sorted    Pebble Breccia Very angular clasts — look at the outline of grain. Angular clasts define it from conglomerate Very mixed composition very...
  36. 36—Congolomerate
    Pebble sized grains, poorly sorted
    Rounded Clasts
    Mixed composition
    Immature rock    Congolomerate Pebble sized grains, poorly sorted Rounded Clasts Mixed composition Immature rock
  37. 37—Shale
    Clay sized grains, fissile
    Very soft rocks
    Less gritty than silt grains, no sign of beddings    Shale Clay sized grains, fissile Very soft rocks Less gritty than silt grains, no sign of beddings
  38. 38—Siltstone
    Silt sized grains, very well sorted
    Very soft rock
    Some distinct grains in the rock
    Grittier than mudstone    Siltstone Silt sized grains, very well sorted Very soft rock Some distinct grains in the rock Grittier than mudstone
  39. 39—Medium grained Feldspathic Arenite
    Pinkish colour indicating feldspar (~35%)
    Some large clasts visible, making it well sorted    Medium grained Feldspathic Arenite Pinkish colour indicating feldspar (~35%) Some large clasts visible, making it well sorted
  40. 40—Lithic Arenite
    >50% lithic grains
    Rock shows a range of grain sizes from fine upper to medium upper
    Greyish colour with "salt and pepper" look is common for lithic aren't    Lithic Arenite &gt;50% lithic grains Rock shows a range of grain sizes from fine upper to medium upper Greyish colour with "salt and pepp...
  41. 41—Medium-grained Quartz Arenite
    >95% quartz grains (Will scratch streak plate)
    Sample is very mature - almost all grains are same size and composition
    Some Quartz have hematite staining in their matrix that makes them look feldspathic, check individual grain, not overall colour    Medium-grained Quartz Arenite &gt;95% quartz grains (Will scratch streak plate) Sample is very mature - almost all grains are same size a...
  42. 42—Mudstone
    Clay Sized Grains, very well sorted
    No sedimentary structures
    Very soft — scratched with nail
    Can be easily mistaken for siltstone but clay grains are less gritty    Mudstone Clay Sized Grains, very well sorted No sedimentary structures Very soft — scratched with nail Can be easily mistaken for siltsto...
  43. 43—Pebble Breccia
    Very angular clasts
    Similar composition
    Very immature rock
    Very poorly sorted — clay size to cobble, majority pebble    Pebble Breccia Very angular clasts Similar composition Very immature rock Very poorly sorted — clay size to cobble, majority pebble
  44. 44—Pebble Conglomerate
    Rounded clasts
    Very mixed composition
    Immature rock
    poorly sorted    Pebble Conglomerate Rounded clasts Very mixed composition Immature rock poorly sorted
  45. 45—Shale
    Very soft rock
    Shows fissility
    Does not show signs of bedding    Shale Very soft rock Shows fissility Does not show signs of bedding
  46. 46—Siltstone
    Very soft rock - scrunchable with steel nail
    Can see distinct grains
    Grittier than mudstone    Siltstone Very soft rock - scrunchable with steel nail Can see distinct grains Grittier than mudstone
  47. 47—Fossiliferous Dolostone
    Mud dominated, >5% fossils so fossiliferous as opposed to lime
    Fossils of amphora (Sponge)
    Will react slowly with HCl when powered    Fossiliferous Dolostone Mud dominated, &gt;5% fossils so fossiliferous as opposed to lime Fossils of amphora (Sponge) Will react slowly w...
  48. 48—Fossiliferous limestone
    Mud and fossils will react strongly with acid    Fossiliferous limestone Mud and fossils will react strongly with acid
  49. 49—Fossiliferous LimestoneFossiliferous Limestone
  50. 50—Fossiliferous limestone
    Empty pore space due to lack of mud matrix
    Grainstone    Fossiliferous limestone Empty pore space due to lack of mud matrix Grainstone
  51. 51—Lime Mudstone
    No Fossils, no bedding
    Often Massive, no other structures    Lime Mudstone No Fossils, no bedding Often Massive, no other structures
  52. 52—Oolitic Limestone
    Ooids are spherical    Oolitic Limestone Ooids are spherical
  53. 53—Fossiliferous Dolostone
    Mud dominated
    Will react slowly with HCl when powdered    Fossiliferous Dolostone Mud dominated Will react slowly with HCl when powdered
  54. 54—Metamorphic rock with dominantly muscovite.
    Kyanite index    Metamorphic rock with dominantly muscovite. Kyanite index
  55. 55—Kyanite and granet Porphyoblasts
    Kyanite zone for the index    Kyanite and granet Porphyoblasts Kyanite zone for the index
  56. 56—Garnet, typically used in metamorphic rocks
    Found in high-grade rocks    Garnet, typically used in metamorphic rocks Found in high-grade rocks
  57. 57—Gabbro with primarily Pyroxene
    Intrusive rock    Gabbro with primarily Pyroxene Intrusive rock
  58. 58—Slatey foliated rocks
    Slate — protolith of shale or mudstone
    low grade rock    Slatey foliated rocks Slate — protolith of shale or mudstone low grade rock
  59. 59—Quartz
    Mineral hardness > 6.5
    Concoidal fracture
    No cleavage    Quartz Mineral hardness &gt; 6.5 Concoidal fracture No cleavage
  60. 60—Hematite
    Metallic Lusture (dull)
    Red brown Streak    Hematite Metallic Lusture (dull) Red brown Streak
  61. 61—Hornblende
    2 cleavage planes not at 90
    vitreous
    Columnar (???)    Hornblende 2 cleavage planes not at 90 vitreous Columnar (???)
  62. 62—Volcanic glass (rock, not mineral)
    Formed from the rapid cooling of lava
    Glassy texture    Volcanic glass (rock, not mineral) Formed from the rapid cooling of lava Glassy texture
  63. 63—Kyanite
    Bladed Habit
    Commonly found in metamorphic rock    Kyanite Bladed Habit Commonly found in metamorphic rock
  64. 64—Pebble Conglomerate
    Moderately Rounded grains
    Pebble Conglomerate    Pebble Conglomerate Moderately Rounded grains Pebble Conglomerate
  65. 65—Hematite
    Hardness of 5.5-6
    red/brown steak
    Metallic Lusture
    weakly magnetic    Hematite Hardness of 5.5-6 red/brown steak Metallic Lusture weakly magnetic
  66. 66—Calcite
    3 cleavage planes not at 90
    Victorious lusture
    Commonly found in (Carbonate sedimentary)
    Reacts strongly with HCl    Calcite 3 cleavage planes not at 90 Victorious lusture Commonly found in (Carbonate sedimentary) Reacts strongly with HCl
  67. 67—Sedimentary rock
    Medium grained
    well sorted    Sedimentary rock Medium grained well sorted
  68. 68—Fine-grained feldspathic arnite
    Fine grained sand
    Found in low energy environments    Fine-grained feldspathic arnite Fine grained sand Found in low energy environments
  69. 69Reacts weakly with HClFossiliferous Dolostone
    Carbonate rock (dolomite present)
    Would become marble if metamorphosed    Reacts weakly with HCl
  70. 70—Alkali feldspar incorporated into the rock
    Perthitic texture
    High silica texture    Alkali feldspar incorporated into the rock Perthitic texture High silica texture
  71. 71—Phylite: Garnet and muscovite / biotite
    Foliated and Phylitic texture
    low grade rock
    Would turn into a schist if continued metamorphoses (Because currently Phylite)    Phylite: Garnet and muscovite / biotite Foliated and Phylitic texture low grade rock Would turn into a schist if continued metamorphoses ...
  72. 72—biotite and Alkali Feldsbar
    Foliated rock
    Possible Protolith: Shale, mudstone or Felsic Igneous Rock    biotite and Alkali Feldsbar Foliated rock Possible Protolith: Shale, mudstone or Felsic Igneous Rock
  73. 73—Intrusive rock — Crystals have been formed
    Dark mineral: Biotite
    Phaneritic and Equigranular texture    Intrusive rock — Crystals have been formed Dark mineral: Biotite Phaneritic and Equigranular texture
  74. 74—Hornblende
    Two cleavage planes not at 90
    Found commonly in Igneous rocks    Hornblende Two cleavage planes not at 90 Found commonly in Igneous rocks
  75. 75Reacts strongly with HCLOoids present — inorganic feature
    Carbonate rock
    Limestone — would be dolostone if reacted weakly with HCL    Reacts strongly with HCL
  76. 76—Shale or Mudstone (Clay sized grains)
    High Fissility
    Would metamorphose into slate under low pressures and temperatures    Shale or Mudstone (Clay sized grains) High Fissility Would metamorphose into slate under low pressures and temperatures
  77. 77—Quartz
    No cleavage
    Colour is not a diagnostic property
    Hardness >6.5    Quartz No cleavage Colour is not a diagnostic property Hardness &gt;6.5
  78. 78Light grey streakVesicular Basalt
    Aphanitic, Vesicular texture
    gas bubbles escaping the cooling water rich lava created the holes
    Intrusive counterpart is Gabbro    Light grey streak
  79. 79—Olivine
    Granular Habit
    Indicative of Mafic rocks    Olivine Granular Habit Indicative of Mafic rocks
  80. 80—Biotite gneiss
    Foliated
    Protolith of shale, mudstone or Felsic igneous rock    Biotite gneiss Foliated Protolith of shale, mudstone or Felsic igneous rock
  81. 81—Porphyritic Andesite
    With Hornblende Phenocrysts    Porphyritic Andesite With Hornblende Phenocrysts
  82. 82—Plagioclase
    2 directions of cleavage at 90
    Twin striations present    Plagioclase 2 directions of cleavage at 90 Twin striations present
  83. 83—Porphyroblastic garnet-biotite schist
    The garnet crystals are porphyroblasts
    This is a metamorphic rock    Porphyroblastic garnet-biotite schist The garnet crystals are porphyroblasts This is a metamorphic rock
  84. 84—Basalt
    extrusive aphanitic rock
    Would metamorphose into amphibolite    Basalt extrusive aphanitic rock Would metamorphose into amphibolite
  85. 85—metamorphic non foliated rock
    Composed primarily of hornblende    metamorphic non foliated rock Composed primarily of hornblende
  86. 86—High grade metamorphic rock with Kyanite crystals
    Bladed habit of the minerals
    Differential hardness    High grade metamorphic rock with Kyanite crystals Bladed habit of the minerals Differential hardness
  87. 87—Biotite
    Single plane of cleavage with hardness 2.5-3    Biotite Single plane of cleavage with hardness 2.5-3
  88. 88Reacts strongly with HClweakly foliated texture
    largely dominated by calcite
    Any Carbonate sedimentary rock could be a possible protolith    Reacts strongly with HCl
  89. 89—Plagioclase (Feldspar)
    two cleavage planes at 90
    Twin striations    Plagioclase (Feldspar) two cleavage planes at 90 Twin striations
  90. 90—Slate
    Sedimentary rock with slit sized grains
    No fossils present
    Low energy point of deposition    Slate Sedimentary rock with slit sized grains No fossils present Low energy point of deposition
  91. 91Reacts weakly to HClDolomite
    3 cleavage planes not at 90
    Indicative of sedimentary rocks (Carbonate)    Reacts weakly to HCl
  92. 92Reacts strongly with HClLime mudstone (Carbonate)
    predominately composed of calcite
    Would metamorphose into a marble    Reacts strongly with HCl
  93. 93—Porphyritic Granite
    Pink crystals are K-fedlspar
    Perthitic texture as a diagnostic property    Porphyritic Granite Pink crystals are K-fedlspar Perthitic texture as a diagnostic property
  94. 94—Aphanetic, porphyritic texture
    Phenocrystals present
    expected Mineralogy of K-feldspar, quartz, plagioclase, muscovite, biotite    Aphanetic, porphyritic texture Phenocrystals present expected Mineralogy of K-feldspar, quartz, plagioclase, muscovite, biotite
  95. 95—Olivine
    Garnular habit
    No planes of cleavage
    Hardness of >6.5    Olivine Garnular habit No planes of cleavage Hardness of &gt;6.5
  96. 96—Quartz
    Hardness >7
    Conciodal fracture    Quartz Hardness &gt;7 Conciodal fracture
  97. 97—Pebble Breccia
    Poorly sorted
    Angular rounding of the grains    Pebble Breccia Poorly sorted Angular rounding of the grains
  98. 98—Hornblende
    Two cleavage planes not at 90
    Harness of 5.5-6    Hornblende Two cleavage planes not at 90 Harness of 5.5-6
  99. 99—Pyrite
    Metallic lusture
    Green-grey streak    Pyrite Metallic lusture Green-grey streak
  100. 100—Muscovite
    Single plane of cleavage
    Found in felsic igneous rocks (felsic, intermediate, mafic, ultramafic)
    High silicate content — Sheet silicate    Muscovite Single plane of cleavage Found in felsic igneous rocks (felsic, intermediate, mafic, ultramafic) High silicate content — Sheet ...
  101. 101—Low grade slate (BROTHER IT LOOKS LIKE PHYLLITE)
    Low-grade metamorphic rocks
    Possible protolith of slate
    If metamorphic grade increased, would become phyllite (or schist if it's actually a phyllite)    Low grade slate (BROTHER IT LOOKS LIKE PHYLLITE) Low-grade metamorphic rocks Possible protolith of slate If metamorphic grade increased, ...
  102. 102Reacts strongly with HClFossiliferous limestone
    Grain dominated by Calcite — fossils
    Grains likely deposited in high energy environment    Reacts strongly with HCl
  103. 103—intermediate rock with hornblende
    Phenocrystals
    The texture indicates two different rates of cooling    intermediate rock with hornblende Phenocrystals The texture indicates two different rates of cooling
  104. 104—foliated Gneissic Metamorphic rock composed of plagioclase / k-feldspar, biotite and garnet
    Protoliths of shale, mudstone or Felix igneous rock    foliated Gneissic Metamorphic rock composed of plagioclase / k-feldspar, biotite and garnet Protoliths of shale, mudstone or Felix igneou...
  105. 105—Andesite
    Alphabetic texture indicative of extrusive rocks    Andesite Alphabetic texture indicative of extrusive rocks
  106. 106—Halite
    3 cleavage planes at 90
    Harness of 3-5.5    Halite 3 cleavage planes at 90 Harness of 3-5.5
  107. 107—Mudstone
    Clay sized grains with no fitsility
    Very well sorted    Mudstone Clay sized grains with no fitsility Very well sorted
  108. 108—Garnet
    Dodecahedral habit
    Harness >6.5    Garnet Dodecahedral habit Harness &gt;6.5
  109. 109—Pyroxene
    2 cleavage planes at 90
    Typically found in igneous rocks (Basalt or Gabbro)    Pyroxene 2 cleavage planes at 90 Typically found in igneous rocks (Basalt or Gabbro)

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University Geology Flashcards on ROCKKS, created by G. Gidluck on 12/10/2026.
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