Dolomite Group

Question 1

(Ca(Fe,Mg,Mn)(CO3)2)

Answer 1

Dolomite-Ankerite

Question 2

Usually as rhombohedra, often with curved faces, and when strongly curved known as “saddle-shaped” crystals.

Answer 2

Dolomite

Question 3

Generally not found in well-formed crystals. When in crystals, they resemble those of dolomite.

Answer 3

Ankerite

Question 4

It has a rhombohedral perfect clevage

Answer 4

dolomite

Question 5

Dolomite has a hardness of ______

Answer 5

3.5 - 4

Question 6

It has a specific gravity of 2.85

Answer 6

Dolomite

Question 7

It has a specific gravity of 3.1

Answer 7

Ankerite

Question 8

It is usually colorless, white, gray, green, or some shade of light pink, or flesh color.

Answer 8

Dolomite

Question 9

Typically yellowish white to yellowish brown (owing to oxidation of some of the iron).

Answer 9

Ankerite

Question 10

Hydrothermal vein mineral, especially in lead and zinc veins that traverse limestone, associated with fluorite, calcite, barite, and siderite.

Answer 10

dolomite

Question 11

A common carbonate in Precambrian iron-formations in association with chert, magnetite, and hematite.

Answer 11

ankerite

Question 12

T or F. Dolomite and ankerite have similar properties as well as for the color differences.

Answer 12

F. except colors

Question 13

(Cu2CO3(OH)2)

Answer 13

Malachite

Question 14

Slender monoclinic, prismatic crystals but seldom distinct.

Answer 14

Malachite

Question 15

Cleavage is pinacoidal perfect but rarely seen

Answer 15

Malachite

Question 16

Malachite has a hardness of ______

Answer 16

3.4 - 4

Question 17

It has a specific gravity of 3.9 - 4.03

Answer 17

Malachite

Question 18

What are the usual color of malachite?

Answer 18

Bright green. Luster adamantine to vitreous in crystals; often silky in fibrous varieties; dull in earthy type.

Question 19

A common supergene copper mineral found in the oxidized portions of copper veins associated with azurite, cuprite, native copper, and iron oxides.

Answer 19

Malachite

Question 20

(Cu3(CO3)2(OH)2)

Answer 20

Azurite

Question 21

Monoclinic with crystals frequently complex and malformed. Also in radiating spherical groups.

Answer 21

Azurite

Question 22

Cleavage is prismatic perfect, pinacoidal fair

Answer 22

Azurite

Question 23

Azurite has a hardness of ______

Answer 23

3.5 - 4

Question 24

It has a specific gravity of 3.77

Answer 24

Azurite

Question 25

The common color of azurite is _________.

Answer 25

Intense azure blue. Luster vitreous.

Question 26

Less common than malachite but of the same origin and associations.

Answer 26

Azurite