sulfates

Question 1

barite formula

Answer 1

BaSO4

Question 2

barite crystal form

Answer 2

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

Question 3

barite cleavage

Answer 3

pinacoidal perfect, prismatic less perfect

Question 4

barite hardness

Answer 4

3 to 3.5

Question 5

barite specific gravity

Answer 5

4.5

Question 6

barite color

Answer 6

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

Question 7

barite occurrence

Answer 7

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

Question 8

barite remarks

Answer 8

yellowish green flame test

Question 9

celestite formula

Answer 9

SrSO4

Question 10

celestite crystal form

Answer 10

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

Question 11

celestite cleavage

Answer 11

basal perfect, prismatic good

Question 12

celestite hardness

Answer 12

3 to 3.5

Question 13

celestite specific gravity

Answer 13

3.95 to 3.97

Question 14

celestite color

Answer 14

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

Question 15

celestite occurrence

Answer 15

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

Question 16

celestite remarks

Answer 16

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

Question 17

anglesite formula

Answer 17

PbSO4

Question 18

anglesite crystal form

Answer 18

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

Question 19

anglesite cleavage

Answer 19

basal good, prismatic imperfect, conchoidal fracture

Question 20

anglesite hardness

Answer 20

3

Question 21

anglesite specific gravity

Answer 21

6.2 to 6.4

Question 22

anglesite color

Answer 22

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

Question 23

anglesite occurrence

Answer 23

supergene mineral in oxidized portions of lead deposits

Question 24

anglesite remarks

Answer 24

high specific gravity and adamantine luster, association with galena

Question 25

anhydrite formula

Answer 25

CaSO4

Question 26

anhydrite crystal form

Answer 26

- orthorhombic, crystals rare - usually massive, crystalline massive resembling an isometric mineral with cubic cleavage - fibrous, massive granular

Question 27

anhydrite cleavage

Answer 27

3 pinacoidal

Question 28

anhydrite hardness

Answer 28

3-3.5

Question 29

anhydrite specific gravity

Answer 29

2.89 to 2.98

Question 30

anhydrite color

Answer 30

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

Question 31

anhydrite occurrence

Answer 31

- 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

Question 32

anhydrite remarks

Answer 32

- 3 cleavages at right angles (diff from barite) - higher specific gravity than calcite - harder than gypsum

Question 33

gypsum formula

Answer 33

CaSO4•2(H2O)

Question 34

gypsum crystal form

Answer 34

- monoclinic, simple habit - tabular on 010 - diamond shaped with beveled edges - twinning on 100: swallowtail twins

Question 35

gypsum cleavage

Answer 35

- 010 pinacoidal perfect - 100 conchoidal - 110 fibrous fracture

Question 36

gypsum hardness

Answer 36

2

Question 37

gypsum specific gravity

Answer 37

2.32

Question 38

gypsum color

Answer 38

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

Question 39

gypsum occurrence

Answer 39

- 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

Question 40

gypsum remarks

Answer 40

softness, three unequal cleavages