Understanding Earth Lab MIDTERM

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University of Northern Iowa; Dr. Gray; Contains Minerals and Rock ID

Last updated 4:03 PM on 9/25/26
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81 Terms

1
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Olivine

green color
can scratch glass

<p>green color<br>can scratch glass</p>
2
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Pyroxene

Dark green to black, two cleavage directions at about 90

<p>Dark green to black, two cleavage directions at about 90</p>
3
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Amphibole

Brown or Black, 2 cleavage directions 60 and 120

<p>Brown or Black, 2 cleavage directions 60 and 120</p>
4
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Biotite

Black to dark brown, one perfect cleavage, flaky

<p>Black to dark brown, one perfect cleavage, flaky</p>
5
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Plagioclase

white to blue-gray, good cleavage at almost 90

<p>white to blue-gray, good cleavage at almost 90</p>
6
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Muscovite

Colorless to pale brown, one perfect cleavage, white streak

<p>Colorless to pale brown, one perfect cleavage, white streak</p>
7
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Orthoclase

pink, 2 cleavages @ 90 degrees

<p>pink, 2 cleavages @ 90 degrees</p>
8
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Quartz

Hardness of 7, fracture pattern, all colors

<p>Hardness of 7, fracture pattern, all colors</p>
9
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Gypsum

white to colorless, hardness 2.5, 1 perfect cleavage

<p>white to colorless, hardness 2.5, 1 perfect cleavage</p>
10
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Calcite

colorless to yellowish, hardness of 3, reaction to HCL

<p>colorless to yellowish, hardness of 3, reaction to HCL</p>
11
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Halite

Colorless to white

hardness 2.5

NaCl

<p>Colorless to white</p><p>hardness 2.5</p><p>NaCl</p>
12
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Talc

white, hardness 1, one perfect cleavage

<p>white, hardness 1, one perfect cleavage</p>
13
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Garnet

redbrown, hardness 7.5

<p>redbrown, hardness 7.5</p>
14
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Flourite

Colorless, violet, yellow, 4 perfect cleavage

<p>Colorless, violet, yellow, 4 perfect cleavage</p>
15
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Limonite

yellowish orange brown, Irregular fracture

<p>yellowish orange brown, Irregular fracture</p>
16
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Galena

Blue-Black to gray, perfect cubic cleavage, metallic

<p>Blue-Black to gray, perfect cubic cleavage, metallic</p>
17
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Hematite

reddish brown, redish brown streak, sub-metallic

<p>reddish brown, redish brown streak, sub-metallic</p>
18
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Magnetite

Black, dense, magnetic

<p>Black, dense, magnetic</p>
19
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Pyrite

Brass yellow, fracture, fool's gold

<p>Brass yellow, fracture, fool's gold</p>
20
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Dolomite

Gray tan

3 perfect cleavages

HCL reaction when dust

<p>Gray tan</p><p>3 perfect cleavages</p><p>HCL reaction when dust</p>
21
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Sulfur

Bright Yellow, bad smell

<p>Bright Yellow, bad smell</p>
22
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Corundum

Grayish, hardness of 9

<p>Grayish, hardness of 9</p>
23
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Graphite

Steel-gray, 1 perfect cleavage, soft, greasy feel

<p>Steel-gray, 1 perfect cleavage, soft, greasy feel</p>
24
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Barite

dense white mineral with an orange to red film

<p>dense white mineral with an orange to red film</p>
25
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chlorite

dark green to black
2.5 on the mohs (can be scratched with a fingernail)

<p>dark green to black<br>2.5 on the mohs (can be scratched with a fingernail)</p>
26
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Sphalerite

source of zinc

<p>source of zinc</p>
27
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Chalcopyrite

dark with a gold luster

fracture

<p>dark with a gold luster</p><p>fracture</p>
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Tourmaline

long striated crystals

fracture

<p>long striated crystals</p><p>fracture</p>
29
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Apatite

blueish gray

glassy

<p>blueish gray</p><p>glassy</p>
30
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Bornite

Oil slick-looking

fracture

<p>Oil slick-looking</p><p>fracture</p>
31
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Name this mineral

olivine

32
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Name this mineral


pyroxene

33
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Name this mineral


Amphibole

34
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Name this mineral


Biotite

35
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Name this mineral


Plagioclase

36
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Name this mineral


muscovite

37
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Name this mineral


orthoclase

38
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Quartz

39
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gypsum

40
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calcite

41
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halite

42
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Name this mineral


talc

43
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garnet

44
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Name this mineral


flourite

45
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limonite

46
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galena

47
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Name this mineral


hematite

48
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magnetite

49
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pyrite

50
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dolomite

51
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sulfur

52
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corundum

53
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graphite

54
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barite

55
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chlorite

56
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Name this mineral


sphalerite

57
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Name this mineral


chalcopyrite

58
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Name this mineral


tourmaline

59
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Name this mineral


apatite

60
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bornite

61
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Granite

62
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Diorite

63
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Gabbro

64
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Name this rock


Basalt

65
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Andesite porphyry

66
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Name this rock


Andesite

67
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Rhyolite

68
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obsidian

69
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Scoria

70
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pumice

71
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Shale

72
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Quartz sandstone

73
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graywacke

74
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Conglomerate

75
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Breccia

76
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chalk

77
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Micrite

78
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fossiliferous limestone

79
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dolomite stone

80
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Chert

81
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Rock gypsum