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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Chalcoyrite CuFeS 2 Physical Properties: Luster: Metallic Color: pale brass yellow Streak: greenish or brownish black Hardness: 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

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