Lecture3 - TheSiliconOxygenTetrahedron silicates

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The Silicon-Oxygen Tetrahedron silicates class of minerals whose crystal structures include Si+O  tetrahedrons [SiO 4 ] -4 Fig. 3-12
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Silicate tetrahedron  (SiO 4 ) 4- Si  4+ O  2- O  2- O  2- 2-
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Neutralizing the excess negative charge on the  (SiO4) 4-   1. Add cations (Fe 2+ , Mg 2+ , K + , Na + ) 2. Link the tetrahedra corner to corner (share the O)
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Table 3-1
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Olivine Pyroxene Hornblende Biotite
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Muscovite Feldspar Quartz
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olivine (MgFe) 2 SiO 4
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Olivine Silicate mineral Dense Has a high melting point Contains Fe and Mg Mafic mineral “Ma”- rich in Magnesium “Fic”- rich in Iron Olivine (Mg,Fe) 2 SiO 4 Can also be pure (Mg) 2 SiO 4 (Fe) 2 SiO 4
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Pyroxene Fig. 3-15
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Silicate Minerals:  pyroxene family Cross section of pyroxene single chains Fig. 3-15
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  ferromagnesian minerals   unselective about cations Silicate Minerals:  amphibole family Double chains of linked tetrahedrons
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Hornblende Hornblende (Ca,Na) 2–3 (Mg,Fe,Al) 5 (Al,Si) 8 O 22 (OH,F) 2
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This note was uploaded on 07/07/2010 for the course GEO geo taught by Professor Long during the Spring '10 term at University of Texas at Austin.

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Lecture3 - TheSiliconOxygenTetrahedron silicates

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