Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

DAY 2: FINAL EXAM > SULFIDES > Flashcards

SULFIDES Flashcards

1
Q

CuS2

A

Chalcocite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Most commonly massive and very fine-grained. If in orthorhombic crystals, usually small and tabular with hexagonal outline.

A

Crystal form of Chalcocite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the cleavage of chalcocite

A

Prismatic {110} poor. Fracture conchoidal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the hardness of chalcocite?

A

2.5 - 3. Imperfectly sectile

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the specific gravity of chalcocite?

A

5.5 - 5.8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

It occurs as a primary mineral in hydrothermal veins, with bornite, chalcopyrite, enargite, and pyrite.

A

Chalcocite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Its most common occurrence is as a supergene mineral in enriched zones of sulfide deposits, often forming “_______” at the level of the water table.

A

chalcocite blankets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Cu5FeS4

A

Bornite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Rarely in tetragonal crystals; usually massive.

A

Crystal form of bornite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Hardness of bornite

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the color of chalcocite?

A

Shining lead gray, tarnished to dull black upon exposure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the specific gravity of bornite?

A

5.06-5.08

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the color of bornite?

A

Brownish bronze on fresh surface but quickly tarnished to variegated purple and blue (hence
called peacock ore) and finally to almost black on exposure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Commonly associated with other sulfides such as chalcocite, chalcopyrite, covellite, pyrrhotite,
and pyrite in hypogene deposits. It occurs less frequently as a supergene mineral in the upper
enriched parts of copper veins.

A

Bornite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

PbS

A

Galena

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Isometric crystals with the most common form the cube, sometimes truncated by the octahedron. Commonly in coarse- to fine-grained cleavable and granular masses.

A

crystal form of galena

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the cleavage of galena?

A

Cubic {001} perfect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the hardness of galena?

A

2.5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the specific gravity of galena?

A

7.4 - 7.6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is the color of galena?

A

Lead-gray with lead-gray streak.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Common metallic sulfide, found in veins associated with sphalerite, marcasite,
chalcopyrite, cerussite, anglesite, calcite, quartz, barite, and fluorite.

A

Galena

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

ZnS

A

Sphalerite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Isometric with the tetrahedron, dodecahedron, and cube as common forms. Crystals are frequently highly complex and usually malformed or in rounded aggregates.

A

sphalerite crystal form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the cleavage of sphalerite?

A

Dodecahedral {011} perfect but some sphalerite is too fine-grained to show cleavage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is the hardness of sphalerite?

A

3.5 - 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is the specific gravity of sphalerite?

A

3.9 - 4.1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What is the color of sphalerite?

A

Colorless when pure ZnS and green when nearly so. Commonly yellow, brown to black, darkening
with increase in iron. Also red (ruby zinc).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

The most common ore mineral of zinc, is widely distributed. Its occurrence and mode of origin are similar to those of galena, with which it is commonly associated.

A

Sphalerite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

CuFeS2

A

Chalcopyrite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Tetragonal, commonly appearing tetrahedral on account of the disphenoid {112}. Usually massive.

A

crystal form of chalcopyrite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What is the hardness of chalcopyrite?

A

3.5 - 4; brittle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

What is the specific gravity of chalcopyrite?

A

3.1 - 3.4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

What is the color of chalcopyrite?

A

Brass yellow; often tarnished to bronze or irridescent.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Very common in occurrence and is one of the most important ore minerals of copper. In low-temperature hydrothermal vein deposits it is found with galena, sphalerite, and dolomite. In higher-temperature deposits it may occur with pyrrhotite and pentlandite.

A

Chalcopyrite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Also known as fools gold.

A

Chalcopyrite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

(Fe(1-x)S) x = 0 - 0.2

A

Pyrrhotite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

Hexagonal (for the high-temperature form),but crystals uncommon. Usually massive,granular.

A

crystal form of pyrrhotite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

What is the hardness of pyrrhotite?

A

4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

What is the specific gravity of pyrrhotite?

A

4.58-4.65

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

Intensity may be variable. Generally easily attracted to a magnet, but much less magnetic than magnetite.

A

Magnetism of pyrrhotite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

What is the color of pyrrhotite?

A

Brownish bronze.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Occurs as disseminated grains in basic igneous rocks such as norites. In sulfide ore deposits commonly associated with pentlandite, chalcopyrite, and other sulfides.

A

pyrrhotite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

(Fe,Ni)9S8

A

Pentlandite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Isometric, but most commonly massive, in granular aggregates with octahedral parting.

A

Pentlandite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

What is the hardness of pentlandite?

A

3.5-4

46
Q

What is the specific gravity of pentlandite?

A

4.6 - 5.0

47
Q

What is the color of pentlandite?

A

Yellowish bronze

48
Q

The major ore mineral for nickel, found in basic igneous rocks associated with nickel sulfides, and chalcopyrite; probably formed by processes of magmatic segregation.

A

Pentlandite

49
Q

CuS

A

Covellite

50
Q

Rarely in tabular, hexagonal crystals. Usually massive as coatings or disseminations through other copper minerals.

A

crystal form of covellite

51
Q

What is the cleavage of covellite?

A

Basal {0001} perfect

52
Q

What is the hardness of covellite?

A

1.5 - 2

53
Q

What is the specific gravity of covellite?

A

4.6 - 4.76

54
Q

What is the color of covellite?

A

Indigo blue or darker.

55
Q

It is not an abundant mineral but is commonly found in most copper ore deposits as a supergene
mineral. It is found with other copper minerals, mainly chalcocite, chalcopyrite, bornite, and
enargite, and derived from them by alteration.

A

Covellite

56
Q

As4S4

A

Realgar

57
Q

Monoclinic, but crystals uncommon. Generally coarse- to fine-granular and often earthy and as encrustations.

A

crystal form of realgar

58
Q

What is the cleavage of realgar?

A

Pinacoidal good

59
Q

What is the hardness of realgar?

A

1.5 - 2;sectile

60
Q

What is the specific gravity of realgar?

A

3.48

61
Q

What is the color of realgar?

A

Red to orange. Streak also red to orange.

62
Q

Found in hydrothermal veins with orpiment, associated with lead and silver minerals, as well as
with stibnite. It also occurs as a volcanic sublimation product and as a deposit from hot springs.

A

occurrence of realgar

63
Q

As2S3

A

Orpiment

64
Q

Monoclinic, but crystals rare. Usually in foliated, columnar, or fibrous masses

A

crystal form of orpiment

65
Q

What is the cleavage of orpiment?

A

Pinacoidal {010} perfect.

66
Q

What is the hardness of orpiment?

A

1.5 - 2

67
Q

What is the specific gravity of orpiment?

A

3.49

68
Q

What is the color of orpiment?

A

Lemon yellow. Streak pale yellow.

69
Q

A rare mineral, associated usually with realgar and formed under similar conditions.

A

Orpiment

70
Q

Orthorhombic. Crystals common. Slender prismatic habit with the prism zone vertically striated.
Most prisms appear bent or twisted as a result of translation gliding.

A

Stibnite crystal form

71
Q

Sb2S3

A

stibnite

72
Q

What is the cleavage of stibnite?

A

Pinacoidal {010} perfect, with striations parallel to [100]

73
Q

What is the hardness of stibnite?

A

2

74
Q

What is the specific gravity of stibnite?

A

4.52-4.62

75
Q

What is the color of stibnite?

A

Lead-gray to black. Streak also lead-gray to black.

76
Q

Found in low-temperature hydrothermal veins or replacement deposits and in hotsprings deposits.
It is associated with other antimony minerals that have formed as the product of its decomposition,
and with galena, cinnabar, sphalerite, barite, realgar, orpiment, and gold.

A

Stibnite

77
Q

FeS2

A

Pyrite

78
Q

Isometric. Frequently in crystals. The most common forms are the cube (the faces of which are
usually striated), the pyritohedron, and the octahedron.

A

crystal form of pyrite

79
Q

What is the cleavage of pyrite?

A

None. Fracture conchoidal.

80
Q

What is the hardness of pyrite?

A

6-6.5

81
Q

What is the color of pyrite?

A

Pale brass yellow; may be darker because of tarnish.

82
Q

One of the most common and widespread sulfide minerals, it is formed at both high and low temperatures. It occurs as magmatic segregations, as an accessory mineral in igneous rocks, and in contact metamorphic deposits and hydrothermal veins.

A

Pyrite

83
Q

Pyrite veins are usually capped by a cellular deposit of limonite, termed ___________.

A

gossan

84
Q

FeS2

A

Marcasite

85
Q

Orthorhombic. Polymorphous with pyrite. Crystals commonly tabular on {010}; less commonly
prismatic parallel to [001]. Often twinned, giving cockscomb and spear-headed groups.

A

crystal form of marcasite

86
Q

What is the hardness of marcasite?

A

6-6.5

87
Q

What is the specific gravity of marcasite

A

4.89

88
Q

What is the color of marcasite?

A

Pale bronze-yellow to almost white on fresh fracture. Yellow to brown tarnish.

89
Q

It is found in metalliferous veins, frequently with lead and zinc ores. It is less stable than pyrite
(being easily decomposed) and much less common. It is commonly found as a supergene mineral
deposited at low temperatures, at near-surface conditions.

A

Marcasite

90
Q

MoS2

A

Molybdenite

91
Q

Hexagonal. Crystals in hexagonal plates or short, slightly tapering prisms. Commonly foliated, massive, or in scales.

A

crystal form of molybdenite

92
Q

What is the cleavage of molybdenite?

A

Basal {0001} perfect, with laminae flexible but not elastic.

93
Q

What is the hardness of molybdenite?

A

1-1.5; greasy feel

94
Q

What is the specific gravity of molybdenite?

A

4.62-4.73

95
Q

What is the color of molybdenite?

A

Lead-gray. Streak grayish black.

96
Q

Found as an accessory mineral in some granites; in pegmatites and aplites. Common in high-temperature vein deposits associated with cassiterite, scheelite, and fluorite.

A

Molybdenite

97
Q

FeAsS

A

Arsenopyrite

98
Q

Monoclinic. Crystals are commonly prismatic and elongated along the c axis and less commonly
along the b. Sometimes with faces striated parallel to [101].

A

crystal form of FeAsS

99
Q

What is the cleavage of arsenopyrite?

A

Prismatic {101}

100
Q

What is the hardness of arsenopyrite?

A

5.5 - 6

101
Q

What is the specific gravity of arsenopyrite?

A

6.07

102
Q

What is the color of arsenopyrite?

A

Silver-white. Streak black.

103
Q

It is the most common mineral containing arsenic. It occurs with tin and tungsten ores in high-temperature hydrothermal deposits.

A

Arsenopyrite

104
Q

Cu3AsS4

A

Enargite

105
Q

Orthorhombic. Crystals elongated parallel to the c axis and vertically striated. Also tabular parallel to {001}. Columnar, bladed, massive.

A

crystal form of enargite

106
Q

What is the cleavage of enargite?

A

Prismatic {110} perfect

107
Q

What is the hardness of enargite?

A

3

108
Q

What is the specific gravity of enargite?

A

4.45

109
Q

What is the color of enargite?

A

Grayish black to iron-black. Streak also grayish black to iron-black.

110
Q

Found in vein and replacement deposits formed at moderate temperatures associated with pyrite, sphalerite, bornite, galena, and chalcocite

A

Enargite

DAY 2: FINAL EXAM (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions