Descriptive Mineralogy Non-Silicates: Carbonates.

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Descriptive Mineralogy Non-Silicates: Carbonates

description

Carbonates Calcite Group Aragonite Group Dolomite Group Other carbonates

Transcript of Descriptive Mineralogy Non-Silicates: Carbonates.

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Descriptive Mineralogy Non-Silicates:

Carbonates

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Classification of the Minerals• Non-Silicates

– Native Elements–Halides– Sulfides– Carbonates– Sulfates– Phosphates– Oxides– Hydroxides

• Silicates– Orthosilicates– Sorosilicates– Cyclosilicates– Chain Silicates– Layer Silicates– Tektosilicates

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Carbonates • Calcite Group• Aragonite Group• Dolomite Group• Other carbonates

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Carbonate Periodic Table

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Calcite Group• Calcite CaCO3

• Magnesite MgCO3

• Siderite FeCO3 • Rhodochrosite MnCO3

• Smithsonite ZnCO3

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Calcite Structure

• Space Group R-3c

• Divalent cation radius < 1.00Å

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Calcite CaCO3

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Calcite CaCO3

Occurrence: Sedimentary: Detrital and Evaporite limestones

Metamorphic: Marble

Low temperature hydrothermal.

Igneous: Carbonatites, Kimberlites

Uses: Building stone, Sculpture, Gravel and paving

Acid mine drainage mitigation

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Rhodochrosite MnCO3

Occurrence: Low T Hydrothermal

Uses: Mineral Specimens

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Siderite FeCO3Occurrence:Low temperature

hydrothermal.

Use; Minor ore of Fe

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Magnesite MgCO3

Occurrence: olivine weathering

Uses: Chalk CO2 Sequestration?

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Smithsonite ZnCO3

Occurrence: Oxidized Hydrothermal (after sphalerite)

Uses: Minor ore of Zn

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Aragonite Group

• Aragonite CaCO3

• Strontianite CaCO3 • Witherite BaCO3

• Cerussite PbCO3

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Aragonite Structure

• Space Group Pbnm

• Cation Radius > 1.00Å

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Aragonite CaCO3

Occurrence: High pressure rocks

Some shells

Boiler scale

Uses: None

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Strontianite SrCO3

Occurrence: Low T Hydrothermal

Uses: Principal source of Sr (used in fireworks, ammunition, flares)

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Witherite BaCO3

Occurrence: Low T Hydrothermal

Uses: Rat Poison

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Witherite transforms at RT from orthorhombic to trigonal

• Witherite (BaCO3)• 0 GPa 8.0 GPa

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Cerussite PbCO3

Occurrence: Oxidized Hydrothermal

Uses: Minor ore of Pb

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Dolomite Group

• Dolomite CaMg(CO3)2

• Ankerite CaFe(CO3)2

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Dolomite CaMg(CO3)2

Occurrence: Sedimentary, Igneous (carbonantites)

Uses: None

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Other Carbonates• Malachite Cu2(CO3)(OH)2

• Azurite Cu3(CO3)2(OH)2

• Bastnasite CeCO3F• Bastnasite REECO3F

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Malachite Cu2CO3(OH)2

Occurrence: Low T Hydrothermal Supergene Cu

Uses: Minor ore of Cu, gems and ornaments

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Azurite Cu3(CO3)2(OH)2

Occurrence: Low T Hydrothermal Supergene Cu

Uses: Minor ore of Cu, gems and ornaments

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Bastnasite CeCO3F

Occurrence: Pegmatite

Uses: Principal Source of Rare Earth Elements

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Bastnasite CeCO3F

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Carbonate Periodic Table

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Gossans are Oxidized Hydrothermal Deposits