SULFATES

Question 1

BaSO4

Answer 1

Barite

Question 2

Orthorhombic crystals usually tabular on {001}. Crystals may be very complex. Frequently in divergent groups or tabular crystals forming “crested” or “roses.”

Answer 2

Barite

Question 3

Cleavage is pinacoidal perfect to prismatic less perfect

Answer 3

Barite

Question 4

The hardness of barite is __________.

Answer 4

3 - 3.5

Question 5

It has a specific gravity of 4.5

Answer 5

Barite

Question 6

What are the usual color of barite

Answer 6

Colorless, white, and light shades of blue, yellow, red.

Question 7

Occurs most commonly in hydrothermal veins associated with ores of silver, lead, copper, cobalt, and manganese.

Answer 7

Barite

Question 8

SrSO4

Answer 8

Celestite

Question 9

Orthorhombic crystals closely resemble those of barite. Commonly tabular on {001} or prismatic parallel to the a or b axis.

Answer 9

Celestite

Question 10

It has a basal perfect and prismatic good

Answer 10

Celestite

Question 11

Celestite has a hardness of _________

Answer 11

3 - 3.5

Question 12

It has a specific gravity of 3.95 - 3.97

Answer 12

Celestite

Question 13

The celestite has a common color of

Answer 13

Colorless, white, often faintly blue or red.

Question 14

Most commonly as disseminations through limestone or sandstone, or in nests and lining cavities in such rocks. Associated with calcite, dolomite, gypsum, halite, sulfur, and fluorite.

Answer 14

Celestite

Question 15

PbSO4

Answer 15

Angelsite

Question 16

Orthorhombic crystals with habit similar to that of barite but more varied. Also massive, granular to compact.

Answer 16

Anglesite

Question 17

It has a cleavage of basal, prismatic imperfect. fracture conchoidal.

Answer 17

Anglesite

Question 18

Anglesite has a usual hardness of ________.

Answer 18

3

Question 19

It has a specific gravity of 6.2 - 6.4

Answer 19

Anglesite

Question 20

Anglesite has a usual color of ___________.

Answer 20

Colorless, white, gray, pale shades of yellow. May be colored dark gray by impurities

Question 21

A common supergene mineral found in the oxidized portions of lead deposits. Associated with galena, cerussite, sphalerite, smithsonite, hemimorphite, and iron oxides.

Answer 21

Anglesite

Question 22

CaSO4

Answer 22

Anhydrite

Question 23

Orthorhombic but rarely in crystals. Usually massive or in crystalline masses resembling an isometric mineral with cubic cleavage.

Answer 23

Anhydrite

Question 24

Anhydrite has a cleavage of _________.

Answer 24

Three pinacoidal cleavages

Question 25

Anhydrite has a hardness of ________.

Answer 25

3 - 3.5

Question 26

Anhydrite has a specific gravity of ___________.

Answer 26

2.89 - 2.98

Question 27

What are the usual color of anhydrite?

Answer 27

Colorless to bluish or violet. May also be white or tinged with rose, red, or brown.

Question 28

Is found in much the same manner as gypsum, with which it is commonly associated, but is less common than gypsum. Occurs in beds associated with salt deposits in the cap rock of salt domes, and in limestones.

Answer 28

Anhydrite

Question 29

CaSO4·2H2O

Answer 29

Gypsum

Question 30

Monoclinic crystals of simple habit. Commonly tabular on {010}; diamond-shaped with beveled edges. Twinning on {100} common, resulting in swallowtail twins.

Answer 30

Gypsum

Question 31

What is the hardness of gypsum?

Answer 31

2

Question 32

What is the specific gravity of gypsum?

Answer 32

2.32

Question 33

What are the usual colors of gypsum?

Answer 33

Colorless, white, gray; various shades of yellow, red, brown, from impurities

Question 34

___________ is a fibrous gypsum with silky luster.

Answer 34

Satin spar

Question 35

_________ is a fine-grained massive variety.

Answer 35

Alabaster

Question 36

_______ is a variety that yields broad, colorless, and transparent cleavage folia.

Answer 36

Selenite

Question 37

Commonly distributed in sedimentary rocks, often as thick beds. Occurs interstratified with limestone and shale and as a layer underlying beds of rock salt.

Answer 37

Gypsum