Native Elements, Sulfides, Halides, Sulfates - Faculty web pages

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Native Elements - Non-metals Polymorphs Diamond - C Isometric Octahedral xstals Strongly bonded structure Each C atoms covalently bonded to 4 C neighbors Graphite – C Hexagonal, metallic luster Greasy feel 1 direction of cleavage H = 1-2
Sulfides: Majority of ore minerals Most opaque with distinctive colors and streaks Galena - PbS Isometric Cubic xstals and cleavage Metallic luster High S.G. = 7.4-7.6 Occurrence: 1) hydrothermal veins; 2) Mississippi Valley deposits Sphalerite - ZnS Isometric, yellow to brown Massive form also tetrahedrons, cubes Yellow streak; Zn ore Occurrence: 1) veins in igneous rocks 2) Mississippi Valley deposits
Page 1 and 2: Native Elements - occur in elementa
Page 3: Native Elements - Non-metals Sulfur
Page 7 and 8: Sulfides: Majority of ore minerals
Page 9 and 10: Halides: Dominated by halogen ions,
Page 11: Sulfates: contain SO 4 2- Hydrous S

Native Elements, Sulfides, Halides, Sulfates - Faculty web pages

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