rl hanna geology rock and mineral prelablpc1.laspositascollege.edu/lpc/hanna/examspractice/...rl...

RL Hanna Geology Rock and Mineral PreLab

A. CD-ROM: Review the Rocks and Minerals section of your lecture text CD-ROM (and/or the chapter in your lab manual and/or lecture textbook, but most students like the CD-ROM better) B. Work the online practice questions – click here: http://lpc1.clpccd.cc.ca.us/lpc/hanna/examspractice/geo10lab/idproperties/idpropertiesquiz1.htm C. Quiz questions: included here – answer them before taking the quiz online.

------------------------------------------------- Example quiz questions: 1. Granite and rhyolite have what common color and chemistry? 2. Basalt and gabbro have what common color and chemistry? 3. Granite and gabbo have what common texture (crystal size)? 4. Basalt and rhyolite have what common texture (crystal size)? 5. What igneous rock has a conchoidal fracture? 6. What rock is dull and has a slaty cleavage? 7. What rock has a slaty cleavage and a sheen? 8. What rock is foliated and is sparkly or spangled? 9. What rock has a banded foliation of relatively large crystals? 10. What rock reacts to acid and has a sub-vitreous to vitreous luster? 11. What rock reacts to acid and has an earthy or dull luster? 12. What mineral reacts easily to cold, dilute HCl acid? 13. What mineral must be powdered before it will react to acid? 14. Both calcite and dolomite will react to acid after being ground into a powder. • True • False 15. What rock will scratch glass and has welded, ‘shattered grains’? 16. What rock has a green color, a waxy luster and slickensides?

http://lpc1.clpccd.cc.ca.us/lpc/hanna/examspractice/geo10lab/idproperties/idpropertiesquiz1.htm


17. What clastic rock has grains too small to be seen with the naked eye (less than 1/16mm in diameter)? 18. What clastic rock has grains the size of sugar crystals (1/16-2mm in diameter)? 19. What clastic rock has many particles the size of gravel, pebbles or larger (greater than 2mm in diameter)? 20. What rock is brown-black, has a relatively low specific gravity and the higher grades have the higher lusters? 21. What rock will react with acid, has an earthy luster, is typically very powdery, and a slightly low specific gravity? 22. What rock has a waxy luster, will scratch glass, and can be any color? 23. What rock is sialic and intrusive? 24. What rock is mafic and intrusive? 25. What rock is sialic and extrusive? 26. What rock is mafic and extrusive? 27. What rock is more than 50% vesicles? 28. What is the name for a vesicular lava rock that is less than 50% vesicles? 29. Without testing or touching the samples, it could be easy to mix up fluorite and quartz. • True • False 30. Without testing or touching the samples, it could be easy to mix up magnetite and basalt. • True • False 31. Without testing or touching the samples, it could be easy to mix up dolomite and marble. • True • False 32. Without testing or touching the samples, it could be easy to mix up dolomite and limestone. • True • False


33. The best test to use to differentiate hematite, chromite and basalt from each other is • color • hardness • luster • magnetism • reaction to acid • specific gravity • streak 34. To differentiate limestone from marble, use • color • hardness • luster • magnetism • reaction to acid • specific gravity • streak 35. A typically green mineral with a vitreous luster, a hardness greater than 5.5; usually found with a granular texture. Often found in basalt vesicles. 36. This mineral scratches glass, a vitreous luster, can be any color, and has a dodecahedral crystal habit. 37. This mineral is typically silver, with a metallic luster and a bladed crystal habit. 38. This mineral scratches glass, can be any color and has crystal habit of hexagonal pyramids with flat ends. 39. This mineral scratches glass, can be any color and has a blocky cleavage (2 directions at almost 90°), and can show exsolution lamellae without twinning. 40. This mineral scratches glass, is typically a green-black color and has a blocky with a dull-to-waxy-luster, and has a blocky cleavage (2 directions at almost 90°). 41. What sample is earthy, generally light colored, and looks like chalk - but isn't?


42. What sample is glassy/vitreous, can be any color, and looks like quartz- but isn't?

43. What is the most diagnostic/distinctive ID property for PLAGIOCLASE FELDSPARS?

44. What is the unique diagnostic/distinctive ID property for GALENA?


45. What is the common diagnostic/distinctive ID property for all varieties of HEMATITE?

46. What is the common hardness for all varieties of QUARTZ?

47. What is the common luster for all varieties of QUARTZ?


48. What is the common cleavage for all varieties of FELDSPAR?

49. What texture is this?


50. What ID property would allow you to tell which one of these samples was chromite?

51. What distinctive/diagnostic ID property do all varieties of mica have in common?


52. What is the cleavage of calcite?

53. Other than the cleavage, what is the most distinctive/diagnostic ID property for calcite?

54. What distinctive/diagnostic ID property is shown here?


55. What luster is shown here?

56. What is the cleavage of hornblende?


57. What is the crystal habit shown here?

58. What is the crystal habit shown here?

59. What is the crystal shape shown here?


60. What is the cleavage shown here?

61. What is the cleavage shown here?

62. What is the crystal shape is shown here?


63. What is the streak of pyrite?

64. What is the streak of chalcopyrite?

65. What is the cleavage of sphalerite?


66. Other than crystal shape or cleavage, what is the best ID property to tell which of these samples is gypsum?

67. Other than crystal shape or cleavage, what is the best ID property to tell which of these samples is quartz? 68. This mineral is typically earthy and yellow-orange in color. 69. How can you tell talc from chalk?


70. How can you tell fluorite from quartz?

• color? • hardness? • luster? • reaction to acid? • magnetism?

rl hanna geology rock and mineral prelablpc1.laspositascollege.edu/lpc/hanna/examspractice/...rl...

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