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Descriptive Mineralogy

Descriptive Mineralogy. Halides: Minerals with Halogen Anions. Classification of the Minerals. Silicates Orthosilicates Sorosilicates Cyclosilicates Chain Silicates Layer Silicates Tektosilicates. Non-Silicates Native Elements Halides Sulfides Oxides Hydroxides Carbonates

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Descriptive Mineralogy

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  1. Descriptive Mineralogy Halides: Minerals with Halogen Anions

  2. Classification of the Minerals • Silicates • Orthosilicates • Sorosilicates • Cyclosilicates • Chain Silicates • Layer Silicates • Tektosilicates • Non-Silicates • Native Elements • Halides • Sulfides • Oxides • Hydroxides • Carbonates • Sulfates • Phosphates

  3. Halides:Minerals with halogen anions • Halite (NaCl) and Sylvite (KCl): Evaporites • Fluorite (CaF2) Low temperature hydrothermal • Cryolite (Na3AlF6): Pegmatite

  4. Halite Cube

  5. Halite NaCl Crystal System Cubic Point Group 4/m-32/m Space Group Fd3m Optical isotropic 1.51 Color colorless Luster Vitreous Hardness 2 Density 2.1 g/cm3

  6. Halite NaCl Occurrence: Evaporites, Salt Domes Uses: Table salt, De-icing, Nuclear waste host rock?

  7. Halite has low density and deforms plastically

  8. Sylvite KCl Crystal System Cubic Point Group 4/m-32/m Space Group Fm3m Optical isotropic 1.45 Color colorless Luster Vitreous Hardness 2 Density 1.99 g/cm3 Occurrence EVP

  9. Potash Ponds near Moab

  10. Fluorite CaF2 Crystal System Cubic Point Group 4/m-32/m Space Group Fm3m Optical isotropic 1.43 Color violet, green Luster Vitreous Hardness 4 Density 3.18 g/cm3 Occurrence LTH

  11. Fluorite Veins in Granite

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