Flashcards
F792 Geology Identifying Rocks
Cards in this deck (10)
- 1What rock group does F belong to and how can you tell?Sedimentary:
- contains fossils / is bioclastic
- cement only occurs in sedimentary rocks - 2What rock group does E belong to and how can you tell?Igneous:
- contains plagioclase phenocrysts
- porphyritic texture
- interlocking crystals
- no cement
- 3Identify this rock and use it characteristics to explain the environment in which it was deposited.Greywacke:
- Deep sea turbidites due to angular, poorly sorted grains.
- Rock fragments held in a matrix
- 4Identify this rock and use it characteristics to identify its environment of deposition.Desert Sandstone:
- Iron oxide cement forms in oxidising desert conditions.
- Well sorted as wind only picks up sediment of one size.
- Rounded due to abrasion.
- All quartz grains suggesting long period of weathering.
- 5Describe the rock and index minerals found in area 1.Hornfels:
- Contains silliminite / andalusite
- Rock is crystalline / granoblastic
- Coarse crystal size
- 6Describe the rock and index minerals found in area 2.Adalusite slate:
- Contains porphyroblasts of andalusite
- Medium crystal size
- 7Describe the rock and index minerals found in area 3.Spotted rock:
- Contains chlorite, biotite, muscovite
- Fine crystal size
- Contains spots of recrystallised minerals
- 8What rock is this? -Coarse grained crystalline texture. - Quartz is prominent - Contains K feldspar and some micaGranite
- 9What rock is this? - Fragmental texture - Fine grained - Layering is visibleShale
- 10What rock is this? - Coarse grained crystalline texture - Quartz is prominent - Mainly plagioclase feldspar - some mafic mineralsGranodiorite
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- AS - Level Geology (F792) Flashcards on F792 Geology Identifying Rocks, created by Izzy Backhouse on 16/05/2016.
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- Izzy Backhouse
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