Mineral Portfolio

Mineralogy, EASC 200Fall, 2007

Montana State - Billings

Casey Heisler

*referred to Wikipedia for some information

Layout of PresentationLayout of Presentation

ElementsElements OxidesOxides SulfidesSulfides SulfatesSulfates CarbonatesCarbonates PhosphatesPhosphates HalidesHalides SilicatesSilicates

CopperCu

Physical Properties:Luster: MetallicColor: Copper-redStreak: Copper-redHardness: 2.5-3Fracture: Hackly

Occurrence: Most are found with basaltic lavas

Crystallography: Isometric

Use: Wiring

Graphite

C

Physical Properties:Luster: OpaqueColor: Gray or BlackStreak: BlackHardness: 1-2Fracture: 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: AdamantineColor: ClearStreak: White Hardness: 10Fracture: Conchoidal

Occurrence:

Use: Rings and jewelry

Crystallography: Isometric-Hexoctahedral (Cubic)

Sulfur

Physical Properties:Luster: OpaqueColor: YellowStreak: Hardness: 2.0Fracture: Diagnostic Features:

Occurrence:

Use: Gunpowder and some rubber

Crystallography: Orthorhombic

S

Quartz

Physical Properties:Luster: VitreousColor: ClearStreak: WhiteHardness: 7Fracture: Conchoidal

Use: quartz clocks, crystal oscillator

Crystallography: 6 sided prism

SiO2

Hematite

Physical Properties:Luster: MetallicColor: Metallic or RedStreak: RedHardness: 5.5-6.5Fracture: Uneven

Use: Pigment

Crystallography: Hexagonal

Fe2O3

Magnetite

Physical Properties:Luster: MetallicColor: Black or grey Streak: BlackHardness: 5.5-6.5Fracture: Uneven

Use:

Crystallography: Octahedral, Isometric

Fe3O4

Geothite

Physical Properties:Luster: Adamantine or dullColor: Yellowish-brownStreak: Yellowish-brownHardness: 5-5.5Fracture: Uneven

Use: An ore of iron

Crystallography: Orthorhombic

FeO(OH)

Corundum

Physical Properties: Luster: Adamantine, dull, vitreousColor: brown, pink, or blueStreak: WhiteHardness: 9Fracture: Conchoidal

Use: Used as gemstones and abrasives

Crystallography: Hexagonal

Al2O2

Pyrite

FeS2

Physical Properties:Luster: MetallicColor: pale brass yellowStreak: greenish or brownish black Hardness: 6-6.5Fracture: 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: MetallicColor: Brass-yellowStreak: Greenish-blackHardness: 3.5-4Fracture: Conchoidal

Use: Important ore of copper

Crystallography: Tetragonal

CuFeS2

Galena

Physical Properties:Luster: MetallicColor: Lead-grayStreak: Lead-grayHardness: 2.5Fracture: 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, resinousColor: Colorless when pureStreak: white or yellow and brownHardness: 3.5-4Fracture:

Use: It is the most important ore of Zinc

Crystallography: Isometric

ZnS

Anhydrite

Physical Properties:Luster:Color:Streak: Hardness:Fracture:

Use:

Crystallography:

CaSO4

Chalcoyrite

CuFeS2

Physical Properties:Luster: MetallicColor: pale brass yellowStreak: greenish or brownish black Hardness: 6-6.5Fracture: Conchoidal, brittleDiagnostic 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