1. Mineral Portfolio Mineralogy, EASC 200 Fall, 2007 Montana State - Billings Casey Heisler *referred to Wikipedia for some information

2. Layout of Presentation Elements Elements Oxides Oxides Sulfides Sulfides Sulfates Sulfates Carbonates Carbonates Phosphates Phosphates Halides Halides Silicates Silicates

3. Copper Cu Physical Properties: Luster: Metallic Color: Copper-red Streak: Copper-red Hardness: 2.5-3 Fracture: Hackly Occurrence: Most are found with basaltic lavas Crystallography: Isometric Use : Wiring

4. Graphite C Physical Properties: Luster: Opaque Color: Gray or Black Streak: Black Hardness: 1-2 Fracture: Flaky Occurrence: Use: Pencil lead Crystallography : Hexagonal (6/m 2/m 2/m). Most forms are tabular, six-sided foliated masses, granular to compacted masses

5. Diamond C Physical Properties: Luster: Adamantine Color: Clear Streak: White Hardness: 10 Fracture: Conchoidal Occurrence: Use: Rings and jewelry Crystallography : Isometric- Hexoctahedral (Cubic)

6. Sulfur Physical Properties: Luster: Opaque Color: Yellow Streak: Hardness: 2.0 Fracture: Diagnostic Features: Occurrence: Use: Gunpowder and some rubber Crystallography : Orthorhombic S

7. Quartz Physical Properties: Luster: Vitreous Color: Clear Streak: White Hardness: 7 Fracture: Conchoidal Use: quartz clocks, crystal oscillator Crystallography : 6 sided prism SiO 2

8. Hematite Physical Properties: Luster: Metallic Color: Metallic or Red Streak: Red Hardness: 5.5-6.5 Fracture: Uneven Use: Pigment Crystallography : Hexagonal Fe 2 O 3

9. Magnetite Physical Properties: Luster: Metallic Color: Black or grey St reak: Black Hardness: 5.5-6.5 Fracture: Uneven Use: Crystallography : Octahedral, Isometric Fe 3 O 4

10. Geothite Physical Properties: Luster: Adamantine or dull Color: Yellowish-brown St reak: Yellowish-brown Hardness: 5-5.5 Fracture: Uneven Use: An ore of iron Crystallography : Orthorhombic FeO(OH)

11. Corundum Physical Properties: Luster: Adamantine, dull, vitreous Color: brown, pink, or blue St reak: White Hardness: 9 Fracture: Conchoidal Use: Used as gemstones and abrasives Crystallography : Hexagonal Al 2 O 2

12. Pyrite FeS 2 Physical Properties: Luster: Metallic Color: pale brass yellow Streak: greenish or brownish black Hardness: 6-6.5 Fracture: Conchoidal, brittle Use: Sometimes used as an iron ore, and mined to be able to find gold or copper Crystallography : Isometric; __

13. Chalcopyrite Physical Properties: Luster: Metallic Color: Brass-yellow Streak: Greenish-black Hardness: 3.5-4 Fracture: Conchoidal Use: Important ore of copper Crystallography : Tetragonal CuFeS 2

14. Galena Physical Properties: Luster: Metallic Color: Lead-gray Streak: Lead-gray Hardness: 2.5 Fracture: Flat Use: One of the only sources of lead which is important for batteries. It is also an important ore of silver Crystallography : Isometric PbS

15. Sphalerite Physical Properties: Luster: Nonmetallic, resinous Color: Colorless when pure Streak: white or yellow and brown Hardness: 3.5-4 Fracture: Use: It is the most important ore of Zinc Crystallography : Isometric ZnS

16. Anhydrite Physical Properties: Luster: Color: Streak: Hardness: Fracture: Use: Crystallography : CaSO 4

19. Chalcoyrite CuFeS 2 Physical Properties: Luster: Metallic Color: pale brass yellow Streak: greenish or brownish black Hardness: 6-6.5 Fracture: Conchoidal, brittle Diagnostic Features: distinguished from gold by its brittleness and hardness, from chalcopyrite by its greater hardness and brittleness. Crystallography : Tetragonal; 42m Most common forms are cubic and octahedron, w. striated faces. Also massive, granular, reniform, globular and stalagtitic. Cubo-octahedral form Pyrite Twins

20. Pyrite (continued) Use: Other: Occurrence : the most common sulfide, forms at both high and low temperatures, Chaclopyrite