Minerals

1. High Quartz (Hexagonal)
2. Low Quartz (Rhombohedral)

1. High temp; low pressure. Quenched
   1. snowflake obsidian

1. High temp; low pressure. Quenched
   1. not as high temp as cristobalite

1. high temp; high pressure
   1. found naturally in impact craters or subducted metamorphic rocks
2. monoclinic

1. higher temp and pressure than coesite
2. tetragonal

Anmerkungen:

• potassium aluminum silicate Alkali Feldspars

1. Orthoclase KAlSi3O8
   1. monoclinic
   2. found in granites. normal cooling rate. Al found in either T1 site
2. T1
   1. T2
      1. T2
         1. T1
3. "crankshaft" tetrahedron arrangement
4. Sanidine (K,Na)AlSi3O8
   1. monoclinic
   2. found in lavas. Quenched. Al in any site
5. Microcline KAlSi3O8
   1. triclinic
   2. has a characteristic twinning. very slow cooling. Al in a single T1 site
6. possess exsolution lamellae (viens); polysynthetic twinning cannot be seen

1. Albite NaAlSi3O8
   1. Sodium rich plagioclase
2. Anorthite CaAl2Si2O8
   1. Calcium rich plagioclase
3. Posseses polysyntheic twinning, seen as striations. Light interacting with the faces show a play of colors. Labradorescence

1. found in basalts

1. silicon deficient albite
2. not a nesosilicate

1. dark blue

1. silica and brucite sheets
2. "TO" arrangement, van der vaals

1. silica and gibbsite sheets
2. "TO" arrangement, van der vaals

1. silica and gibbsite sheets
2. "TO" arrangement? van der vaals

1. silica and brucite sheets
2. "TOT" arrangement, van der vaals

1. Phlogopite KMg3(AlSi3O10)
   1. "TOT" arrangement, like talc but with K in between instead of van der vaals
   2. silica and brucite sheets
2. Biotite K(Fe,Mg)3(AlSi3O10)(OH)2
   1. silica and brucite sheets

1. Muscovite KAl2(AlSi3O10)(OH)2
   1. "TOT" arrangement with K in between
   2. silica and gibbsite sheets
2. Lepidolite K(Li,Al)2-3(AlSi3O10)(OH)2

1. variable combinations of talc and brucite

1. Enstatite Mg2Si2O6
   1. lower left corner of triangle
2. Ferrosilite Fe2Si2O6
   1. lower right corner of triangle

1. Diopside CaMgSi2O6
   1. 50% Ca, Mg side
2. Hedenbergite CaFeSi2O6
   1. 50% Ca, Fe side

1. Pigeonite (Ca,Mg,Fe)2Si2O6
   1. thin area above lower most part of triangle
2. Augite (Ca,Mg,Fe,Na)(Mg,Fe,Al)(Si,Al)2O6
   1. drop between diopside and hedenburgite
3. Jadeite NaAlSi2O6
   1. High grade regional metamorphism
4. Acmite/Aegerine NaFeSi2O6
   1. Na-rich granites (alkali granties)

1. Cummingtonite (Mg,Fe)7Si8O22(OH)2
2. Grunerite Fe7Si8O22(OH)2
   1. can be found as amosite asbestos. Fe in sea water=banded iron

1. Temolite Ca2Mg5Si8O22(OH)2
   1. from sandy dolomite
2. Actinolite Ca2(Fe,Mg)5Si8O22(OH)2

1. Anthophyllite Mg7Si8O22(OH)2
2. Glaucophane Na2MG3Al2Si8O22(OH)2
   1. blue schist metamorphism
3. Hornblende (K,Na)0-1(Mg,Fe2+,Fe3+,Al)5(Si6-8,Al2-0)O22(OH)2
   1. K,Na in A-site (in between flat side of chains)
   2. Amphibolite

1. Pyrope Mg3Al2Si3O12
   1. metamorphic
2. Almandine Fe3Al2Si3O12
   1. metamorphic
3. Spessartine Mn3Al2Si3O12
   1. in clay

1. Uvarovite Ca3Cr2Si3O12
   1. green
2. Grossular Ca3Al2Si3O12
   1. in clay
3. Andradite Ca3Fe2Si3O12

1. contact metamorphism; orthorhombic
2. top section of diagram

1. triclinic
2. left side of diagram

1. orthorhombic
2. right side of diagram