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Corel Day 2 > sulfates > Flashcards

sulfates Flashcards

1
Q

barite formula

A

BaSO4

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2
Q

barite crystal form

A
  • orthorhombic, tabular on {001}
  • frequently divergent groups or tabular crystals forming crested barite or barite roses
  • coarsely laminated, granular, earthy
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3
Q

barite cleavage

A

pinacoidal perfect, prismatic less perfect

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4
Q

barite hardness

A

3 to 3.5

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5
Q

barite specific gravity

A

4.5

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6
Q

barite color

A

vitreous, transparent to translucent. pearly on the base on some. colorless white light shades of red blue and yellow

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7
Q

barite occurrence

A

hydrothermal veins associated with ores of silver, lead, copper, cobalt and manganese

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8
Q

barite remarks

A

yellowish green flame test

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9
Q

celestite formula

A

SrSO4

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10
Q

celestite crystal form

A
  • orthorhombic tabular on {001}, same with barite
  • prismatic parallel to the a or b axis
  • radiating fibrous, granular
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11
Q

celestite cleavage

A

basal perfect, prismatic good

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12
Q

celestite hardness

A

3 to 3.5

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13
Q

celestite specific gravity

A

3.95 to 3.97

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14
Q

celestite color

A

vitreous to pearly transparent to translucent. colorless white and faintly red and blue

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15
Q

celestite occurrence

A
  • disseminations in sandstone or limestone
  • nests or lining of cavities in ss or ls
  • lead veins with galena
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16
Q

celestite remarks

A
  • usual pale blue color
  • fine radiating/ fibrous habit
  • crimson flame test and lower specific gravity
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17
Q

anglesite formula

A

PbSO4

18
Q

anglesite crystal form

A
  • orthorhombic, tabular on {001} like barite but more varied
  • coarse, granular to compact
  • earthy, concentric layers with unaltered galena core
19
Q

anglesite cleavage

A

basal good, prismatic imperfect, conchoidal fracture

20
Q

anglesite hardness

A

3

21
Q

anglesite specific gravity

A

6.2 to 6.4

22
Q

anglesite color

A

adamantine crystal, dull earthy. transparent to translucent. colorless white gray, pale shades of yellow. dark gray if impurities

23
Q

anglesite occurrence

A

supergene mineral in oxidized portions of lead deposits

24
Q

anglesite remarks

A

high specific gravity and adamantine luster, association with galena

25
Q

anhydrite formula

A

CaSO4

26
Q

anhydrite crystal form

A
  • orthorhombic, crystals rare
  • usually massive, crystalline massive resembling an isometric mineral with cubic cleavage
  • fibrous, massive granular
27
Q

anhydrite cleavage

A

3 pinacoidal

28
Q

anhydrite hardness

A

3-3.5

29
Q

anhydrite specific gravity

A

2.89 to 2.98

30
Q

anhydrite color

A

vitreous to pearly on cleavage. colorless bluish to violet. white or tinged with rose red or brown

31
Q

anhydrite occurrence

A
  • same with gypsum, associated with gypsum but less common
  • in beds associated with salt deposits in the caps of salt domes and in limestone
  • in amygdaloidal cavities in basalt
32
Q

anhydrite remarks

A
  • 3 cleavages at right angles (diff from barite)
  • higher specific gravity than calcite
  • harder than gypsum
33
Q

gypsum formula

A

CaSO4•2(H2O)

34
Q

gypsum crystal form

A
  • monoclinic, simple habit
  • tabular on 010
  • diamond shaped with beveled edges
  • twinning on 100: swallowtail twins
35
Q

gypsum cleavage

A
  • 010 pinacoidal perfect
  • 100 conchoidal
  • 110 fibrous fracture
36
Q

gypsum hardness

A

2

37
Q

gypsum specific gravity

A

2.32

38
Q

gypsum color

A

pearly, vitreous, silky. translucent to transparent. colorless white gray yellow red brown. satin spar alabaster and selenite

39
Q

gypsum occurrence

A
  • in sedimentary rocks as thick beds: interstratified with limestone and shale or underlying beds of rock salt, alteration of anhydrite
  • volcanic regions
  • gangue of metallic veins
40
Q

gypsum remarks

A

softness, three unequal cleavages

Corel Day 2 (17 decks)

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