Descriptive Mineralogy Non-Silicates:

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Presentation transcript:

Descriptive Mineralogy Non-Silicates: Sulfates

Sulfates Gypsum CaSO4•2H2O Anhydrite CaSO4 Celestine SrSO4 Barite BaSO4 Anglesite PbSO4 Alunite KAl3(OH)6(SO4)2

Gypsum CaSO4•2H2O Hardness 2 Evaporite Mineral Contains molecular water

Anhydrite CaSO4 Hardness 3-3.5 Evaporite Mineral Contains no molecular water

Celestine SrSO4 Occurrence: Low T Hydrothermal Use: Principal source of Sr

Barite BaSO4 Occurrence: Low T Hydrothermal Uses:Source of Ba, Drilling Mud

Anglesite PbSO4 Occurrence: Oxidized Hydrothermal Use: Minor Pb Ore

Alunite KAl3(SO4)2(OH)6 Occurrence: Hydrothermal Acid sulfate alteration (After feldspar) Use: Associated with gold

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