Minerals

Question 1

Sulfur

Answer 1

a) S b) Native Element c) Smell and yellow color

Question 2

Graphite

Answer 2

a) C b) Native Element c) Greasy feel, black streak

Question 3

Copper

Answer 3

a) Cu b. Native Element c. reddish color, hackly fracture, high specific gravity, and malleability

Question 4

Chalcocite

Answer 4

a) Cu2S b. Sulfide c. Lead-gray color and sectility

Question 5

Bornite

Answer 5

a. Cu5FeS4 b. Sulfide c. peacock color or bronze coor with a purple tarnish

Question 6

Galena

Answer 6

a. PbS b. Sulfide c. High specific gravity, cubic cleavage, softness, lead-gray streak

Question 7

Sphalerite

Answer 7

a. ZnS b. Sulfide c. Smell, resinous luster, reddish-brown streak

Question 8

Chalcopyrite

Answer 8

a. CuFeS2 b. Sulfide c. Brass-yellow color, greenish-black streak. Softer than steel (pyrite is stronger) and Brittler than gold

Question 9

Pyrrhotite

Answer 9

a. Fe1-xS b. Sulfide c. Massive nature, bronze color, and magnetism

Question 10

Cinnabar

Answer 10

a. HgS b. Sulfide c. Red color, scarlet streak, high specific gravity, and rhmobohederal cleavage

Question 11

Realgar

Answer 11

a. AsS b. Sulfide c. Red color, resinous luster, orange-red streak

Question 12

Orpiment

Answer 12

a. As2S3 b. Sulfide c. Yellow-orange color, foliated, perfect cleavage

Question 13

Stibnite

Answer 13

a. Sb2S3 b. Sulfide c. Easy fusibility, bladed habit, perfect cleavage in one direction, lead-gray color, soft black streak. Fusible in a candle flame

Question 14

Pyrite

Answer 14

a. FeS2 b. Sulfide c. Various isometric crystals. Harder than chalcopyrite.

Question 15

Marcasite

Answer 15

a. FeS2 b. Sulfide c. Pale yellow color, fibrous.

Question 16

Arsenopyrite

Answer 16

a. FeAsS b. Sulfide c. Silver-wite color, streaks black.

Question 17

Molybdenite

Answer 17

a. MoS2 b. Sulfide c. Like graphite, but with higher specific gravity. Has a slight blue tone. Green streak.

Question 18

Skutterrudite

Answer 18

a. (Co,Ni)As3 b. Sulfide c. Tin-white to silver-gray color. Shiny!

Question 19

Tetrahedrite

Answer 19

a. Cu12Sb4S13 b. Sulfide c. Tetrahedral crystal habit, no cleavage, steel gray or silver color

Question 20

Halite

Answer 20

a. NaCl b. Halide c. Tastes salty, perfect cubic cleavage, less bitter than sylvite

Question 21

Sylvite

Answer 21

a. KCl b. Halide c. Bitter taste, perfect cleavage, cubic crystals

Question 22

Flourite

Answer 22

a. CaF2 b. Halide c. Cubic crystal and octahedral cleavage and can be scratched with a knife

Question 23

Cryolite

Answer 23

a. Na3AlF6 b. Halide c. Pseudocubic parting, white color.

Question 24

Magnetite

Answer 24

a. Fe3O4 b. Oxide c. Strong magnetism, black color, hardness.

Question 25

Chromite

Answer 25

a. FeCr2O4 b. Oxide c. Submetallic luster

Question 26

Corundum

Answer 26

a. Al2O3 b. Oxide c. Very hard, high specific gravity, Infusible, Barrel shaped crystals

Question 27

Hematite

Answer 27

a. Fe2O3 b. Oxide c. Red streak in both forms

Question 28

Goethite (Limonite)

Answer 28

a. aFeO(OH) b. Oxide c. Yellow-brown streak

Question 29

Ilmenite

Answer 29

a. FeTiO3 b. Oxide c. No magnetism, black to brownish red streak

Question 30

Pyrolusite

Answer 30

a. MnO2 b. Oxide c. Black streak and low hardness

Question 31

Brucite

Answer 31

a. Mg(OH)2 b. Oxide c. Foliated, light color, pearly luster. Inelastic

Question 32

Ulexite

Answer 32

a. NaCaB5O6(OH)6-5H20 b. Oxide c. Soft with silky luster, fiberopti c.

Question 33

Romanechite (psilomelane)

Answer 33

a. BaMn2+Mn84+016(OH)4 b. Oxide c. Botyryoidal form. Dendritic pattern

Question 34

Calcite

Answer 34

a. CaCO3 b. Carbonate c. Effervesce readily in cold dilute HCL. Not very hard. Light color. Rhombohedral Cleavage

Question 35

Magnesite

Answer 35

a. MgCO3 b. Carbonate c. Dissolves in hot HCL. Looks like Chert. Lack of calcium

Question 36

Siderite

Answer 36

a. FeCO3 b. Carbonate c. Only dark brown carbonate. hot HCL effervences

Question 37

Rhodochrosite

Answer 37

a. MnCO3 b. Carbonate c. Pink color, rhombohedral cleavage. Infusible. Soluble in hot HCL

Question 38

Smithsonite

Answer 38

a. ZnCO3 b. Carbonate c. Soluble in cold HCL. Harder than calcite. Has Zin c.

Question 39

Dolomite

Answer 39

a. CaMg(CO3)2 b. Carbonate c. Cold dilute HCL some dissolution, but mostly in hot. Often flesh-pink color

Question 40

Aragonite

Answer 40

a. CaCO3 b. Carbonate c. Higher specific gravity than Calcite. No Rhombohedral cleavage. Effervesces in cold HCl

Question 41

Strontianite

Answer 41

a. SrCO3 b. Carbonate c. High specific gravity. Poor cleavage

Question 42

Cerussite

Answer 42

a. PbCO3 b. Carbonate c. Effervesces in nitric acid, white color, high specific gravity, and cleavage

Question 43

Azurite

Answer 43

a. Cu3(CO3)2(OH)2 b. Carbonate c. Azure blue color

Question 44

Malachite

Answer 44

a. Cu2CO3(OH)2 b. Carbonate c. Bright green color. Soluble in HCL, yielding a green solution.

Question 45

Apatite

Answer 45

a. Ca5(PO4)3(F,Cl,OH, CO3) b. Phosphate c. Crystals, colors, and hardness. Prominent pyramidal termination of its crystal and softer than a knife's blade

Question 46

Wavelite

Answer 46

a. Al3(PO4)2(OH)3-5H20 b. Phosphate c. Radiating Globular Aggregates

Question 47

Lazulite

Answer 47

a. (Mg,Fe)Al2(PO4)2(OH)2 b. Phosphate c. Blue color

Question 48

Amblygonite

Answer 48

a. LiAlFPO4 b. Phosphate c. Similar to feldspar, but angles different

Question 49

Barite

Answer 49

a. BaSO4 b. Sulfate c. High specific gravityTabular crystals

Question 50

Celestite

Answer 50

a. SrSO4 b. Sulfate c. Chemical test for strontium, lighter than barite.

Question 51

Anglesite

Answer 51

a. PbSO4 b. Sulfate c. High specific gravity, similar to cerussite, does not effervesce in nitric acid

Question 52

Anhydrite

Answer 52

a. CaSO4 b. Sulfate c. Three cleavage at right angles. Harder than gypsum.

Question 53

Gypsum

Answer 53

a. CaSO4-2H20 b. Sulfate c. Softness and three unequal cleavages

Question 54

Wulfenite

Answer 54

a. PbMoO4 b. Molybdate c. Square tabular color, orange to yellow color.