Section Date Physical Geology Activity Rock Cyele Worksheet Distinctive Property

Question

Section Date Physical Geology Activity Rock Cyele Worksheet Distinctive Property Original Material Geologic Process New Material cooling and crystallization pink color and coarse crystals 1. magma 2 sand Aggregate of visible sand grains cemented together 3 granite gneiss no pore space between fused grains quartzite slate foliation liquid 6. gneiss clay Layered rock 7. granine 8. imestone 9 magma 10. shale weathering. ec. 12. lava black with small crystals fizz in acid Glassy with conchoidal fracture 13. shell 14. cooling without I5. quartzite gravel 16. plant remains layered black rock cooling and crystallization 17 50% black and 50% while coarse crystals lithificatiorn

Explanation / Answer

1. New Material: Feldspar.

Feldspar is abundantly found in igneous rocks although it is found in metamorphic as well as a few sedimentary rocks. It has a beautiful pink colour and can be easily spotted in granites as well. Feldspar is formed mainly from felsic magma which is rich in Silica.

In rock bodies they can be easily seen in veins formed by igneous intrusions into the host rocks. They have a decent hardness of 6 and generally have a glassy appearance.

2. Activity: Weathering, erosion and deposition by wind or water followed by compaction and lithification.

Weathering of rocks causes breaking down of the rock body into smaller fragments. These particles are carried by wind or water (from river etc.) and are deposited where the velocity of the water/ river slows down. These deposits are layered and due to gravity and the weight of the overlying beds, compaction of the lower layers takes place. This results in a cementing of the loose sediments- giving rise to sandstone.

3. Distinctive Property: Thin alternate light and dark coloured banding seen distinctly between thin layers. The darker layers are mafic (rich in Magnesium and Iron) in composition while the lighter layers are felsic in composition rich in silica.

Gneisses are predominantly formed by metamorphism of igneous rocks. Not to be confused by cross-bedding or bedding that is a common arrangements of rock particles seen in sedimentary rocks, Gneisses are formed under high temperature-pressure conditions and have crystalline composition.

4. Original Material: Sandstone with high content of quartz

Quartzite forms under high pressure-temperature and with chemical processes which fuses the quartz crystals in sandstone together with the help of silica to form a low pore-space rock.

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