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GEOLOGY TEST OUT REVIEW

This comprehensive geology test review covers major minerals like pyrite, chalcopyrite, and magnetite, as well as different rock types such as igneous, sedimentary, and metamorphic rocks. Learn about their properties, formations, and distinguishing characteristics to ace your geology exam!

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GEOLOGY TEST OUT REVIEW

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  1. GEOLOGY TEST OUT REVIEW

  2. pyrite chalcopyrite

  3. Magnetic Heavy Metallic Black streak magnetite

  4. 3= 90 cleavage Metal heavy galena

  5. graphite • writes

  6. Most common mineral Scratches glass NMV Hexagonal crystals quartz

  7. Fizzes 3 ≠ 90 cleavage Double refraction Soft Main mineral in limestone and marble calcite

  8. biotite

  9. Flakey- 1 directional cleavage Light in color muscovite

  10. Salty 3= 90 cleavage soft halite

  11. talc • kaolinite

  12. Red streak Metal Heavy HEMATITE

  13. Olivine • green

  14. Scratches glass White 2 directional cleavage plagioclase

  15. Pink Scratches glass 2= 90 cleavage K-feldspar (orthoclase)

  16. gypsum • Soft; chalky

  17. Deep red Hard= 8 garnet

  18. Soft Many colors; purple and green 4 directional cleavage fluorite

  19. chalcedony • Microcrystalline quartz • White-blue • Globby looking

  20. Hornblende Dark black Hardness ≈ 6 AMPHIBOLE

  21. Dark green to black augite PYROXENE

  22. Amphibole vs. pyroxene

  23. IGNEOUS ROCKS

  24. Intrusive igneous Cooled slowly Felsic Has quartz, plag., biotite, K-feld, hornblende Formed underground (dikes, sills, batholiths) GRANITE

  25. “black granite” Intrusive Mafic Formed underground (dikes, sills, batholiths) Granite’s mafic cousin gabbro

  26. Felsic extrusive rhyolite

  27. Rhyolite porphyry

  28. This rhyolite is usually on the test!!

  29. Extrusive Mafic Shield volcanoes From runny lava flows Pahoehoe and Aa are types of basalt basalt

  30. andesite

  31. Andesite Porphyry • Contains plag • From strato volcanoes (extrusive)

  32. pegmatite • Coarse granite

  33. Salt and pepper No quartz diorite

  34. SEDIMENTARY

  35. Round pebbles conglomerate

  36. Gritty From beach/desert clastic sandstone

  37. Fine clastic From mud shale

  38. Looks like limestone Slow fizz dolostone

  39. Bioclastic From swamps Organic lightweight coal

  40. Fossiliferous limestone

  41. Fizzes Chemical precipitate Forms in deep ocean From dissolved shells limestone

  42. Oolitic limestone

  43. Like shale Not as flat siltstone

  44. Metamorphic

  45. Banded (striped) Foliated Parent rock- granite Gneiss

  46. Foliated Highly reflective May have garnets Amphibole- black sparkly Mica schist Schist

  47. Metamorphosed shale foliated slate

  48. Can be many colors Metamorphosed limestone Not foliated Will fizz (calcite) marble

  49. Metamorphosed sandstone Non foliated Will scratch glass Any color Quartzite

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