302-pp20 - UNIVERSITY OF SOUTH ALABAMA Last Time Class VIII...

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GY 302: Crystallography & Mineralogy GY 302: Crystallography & Mineralogy UNIVERSITY OF SOUTH ALABAMA Lecture 20: Class VIII-Silicates Soro- and Cyclosilicates Lecture 20: Class VIII-Silicates Soro- and Cyclosilicates Last Time Class VIII Minerals: Nesosilicates 1. Garnet Group 2. Aluminum Silicates 3. Other Nesosilicates andradite Silicate Classification Almandine Grossular Nesosilicates http:/ www.geol.lsu.edu/henry/Geology3041/lectures/21MetamorphicIntro/BarrovianBuchan.jpg Today’s Agenda Class VIII Minerals 1. Sorosilicates 2. Cyclosilicates (3, 4 and 6 fold coordination) Sorosilicates Mineral Formula System Zoisite Ca 2 Al 3 O(SiO 4 )(Si 2 O 7 )(OH) Orthorhombic Clinozoisite Ca 2 Al 3 O(SiO 4 )(Si 2 O 7 )(OH) Monoclinic Epidote Ca 2 (Al,Fe)Al 2 O(SiO 4 )(Si 2 O 7 )(OH) Monoclinic Allanite (Ca,Ce) 2 (Fe,Fe)Al 2 O(SiO 4 )(Si 2 O 7 )(OH) Monoclinic Lawsonite CaAl 2 SiO 7 (OH) 2 ·H 2 O Orthorhombic Pumpellyite Ca 2 MgAl 2 (SiO 4 )(Si 2 O 7 )(OH)2·H 2 O Monoclinic Vesuvianite (Idocrase) Ca 10 Mg 2 Al 4 (SiO 4 ) 5 (Si 2 O 7 ) 2 (OH) 4 Tetragonal Hemimorphite Zn 4 Si 2 O 7 (OH) 2 ·(H 2 O) Orthorhombic
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Sorosilicates Mineral Formula System Zoisite Ca 2 Al 3 O(SiO 4 )(Si 2 O 7 )(OH) Orthorhombic Clinozoisite Ca 2 Al 3 O(SiO 4 )(Si 2 O 7 )(OH) Monoclinic Epidote Ca 2 (Al,Fe)Al 2 O(SiO 4 )(Si 2 O 7 )(OH) Monoclinic Allanite (Ca,Ce) 2 (Fe,Fe)Al 2 O(SiO 4 )(Si 2 O 7 )(OH) Monoclinic Lawsonite CaAl 2 SiO 7 (OH) 2 ·H 2 O Orthorhombic Pumpellyite Ca 2 MgAl 2 (SiO 4 )(Si 2 O 7 )(OH)2·H 2 O Monoclinic Vesuvianite (Idocrase) Ca 10 Mg 2 Al 4 (SiO 4 ) 5 (Si 2 O 7 ) 2 (OH) 4 Tetragonal Hemimorphite Zn 4 Si 2 O 7 (OH) 2 ·(H 2 O) Orthorhombic Epidote [Ca 2 (Al,Fe)Al 2 O(SiO 4 )(Si 2 O 7 )(OH)] Crystal: Monoclinic Pt. Group: 2/m Habit: fibrous, prismatic, massive SG: 3.4-3.5; H: 7 L: vitreous to earthy; Str: white Col: green to yellow Clev: perfect (001), poor (100) Optics: Biaxial (-); bir=0.013-0.046 n α =1.723; n β =1.73, n γ =1.736 Sorosilicate Minerals ht p:/ www.gc.maricopa.edu/earthsci/imagearchive/pictures2.htm Name Derivation: From the Greek epidosis - "addition." Zoisite [Ca 2 Al 3 O(SiO 4 )(Si 2 O 7 )(OH)] Crystal: Orthorhombic Pt. Group: 2/m 2/m 2/m Habit: prismatic, massive SG: 3.1-3.4: H: 6.5 L: vitreous; Str: white Col: blue-green Clev: perfect (001) Optics: Biaxial (+); bir=0.006
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This note was uploaded on 02/05/2012 for the course GLY 302 taught by Professor Staff during the Spring '11 term at S. Alabama.

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302-pp20 - UNIVERSITY OF SOUTH ALABAMA Last Time Class VIII...

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