Isomorphism

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Isomorphic Materials

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Isomorphic Materials

Materials that can contain ALTERNATIVE ATOMS within the SAME basic crystal structure

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Isomorphic Replacement

  • Replacement of 1 chemical element by another in a crystalline material

  • crystal structure stays the same but physical properties vary

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Isomorphism

minerals exhibit isomorphism when then have identical external forms but differ chemically

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4 Isomorphic groups

  1. Garnet Group

  2. Feldspar Group

  3. Olivine Group

  4. Tourmaline

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2 groups in garnet family

  1. Pyralspite

  2. Ugrandite

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3 garnet species in the Pyralspite Group

  1. Pyrope

  2. Almandine

  3. Spessartine

  • "Pyr" = greek for fire!

  • Aluminum garnets

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3 garnet species in the Ugrandite Group

  1. Uvarovite

  2. Grossular

  3. Andradite

  • Calcium garnets!

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Pyralspite Group physical properties

  • pure red to orange-red colours

  • "Pyr" = greek for fire!

  • Aluminum garnets (Al as Y element)

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Ugrandite Group physical properties

  • brown, yellow, green colous

  • Calcium garnets! (Ca as X element)

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2 Feldspar Families

  1. Alkali Feldspar

  2. Plagioclase Feldspar

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Distinguishing Element in Alkali Feldspar

Potassium (K)

  • potassium added into chemical formula of these stones

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3 feldspar species in Alkali Feldspar Family

  1. Anorthoclase

  2. Sanidine/ Orthoclase, Moonstone

  3. Microline Amazonite

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6 feldspar species in Plagioclase Feldspar Family

  1. Albite

  2. Oligoclase

  3. Andesine

  4. Labradorite

  5. Bytownite

  6. Anorthite

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2 species in Olivine Group

  1. Forsterite

  2. Fayalite

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