302-pp23 - Mineral Quizzes Results Quiz 8:...

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Mineral Quizzes Results 1: Grossular (100%) 2: Zoisite (83%) 3. Beryl (67%) 4: Tourmaline (56%) 5: Epidote (78%) 6: Axinite (61%) Bonus: Gypsum (50%) Average: 85.8% Highest grade: 103% (2) Quiz 8: Neso/Soro/Cyclosilicates
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GY 302: Crystallography & Mineralogy GY 302: Crystallography & Mineralogy UNIVERSITY OF SOUTH ALABAMA Lecture 23: Phyllosilicates 1 Mica Minerals etc. Lecture 23: Phyllosilicates 1 Mica Minerals etc.
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Last Time Class VIII Minerals: Inosilicates (part 2) 1. Amphiboles
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Inosilicates (single chain)
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Inosilicates (double chain) Two major sub groups of amphiboles are distinguished on the basis of crystal structure: 1) Orthorhombic Amphiboles 2) Monoclinic Amphiboles http://www.uwgb.edu/dutchs/GRAPHIC0/ROCKMIN/ATOM-STRUCT/amphibchain.gif
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Inosilicates (double chain) General formula: XY((Al,Si) 4 O 11 ) 2 (OH) 2 X [larger ions] = Ca 2+ , Na + Y [smaller ions] = Mg 2+ , Al 3+ , Fe 2+/3+ , Mn 2+/3+ ) http://www.tulane.edu/~sanelson/images/amphibole_cleavage.gif
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Inosilicates (double chain) http://www.tulane.edu/~sanelson/images/amphibole-compositions.gif We recognize several amphibole series (solid solution) 1) Anthophyllite Series (Orthorhombic) 2) Cummingtonite Series (Monoclinic) 3) Actinolite Series (Monoclinic) 4) Hornblende Series (Monoclinic) 5) Glaucophane Series (Monoclinic) 6) Riebeckite Series (Monoclinic) 7) Arfvedsonite-Eckermannite Series (Mono) “Hornblende”: (Ca,Na,K) 2-3 (Mg,Fe,Al) 5 Si 6 (Si,Al) 2 O 22 (OH) 2 “Glaucophane”: Na 2 Mg 3 Al 2 Si 8 O 22 (OH) 2 “Riebeckite”: Na 2 Fe 2+ 3 Fe 3+ 2 Si 8 O 22 (OH) 2 “Arvedsonite”: Na 3 (Mg,Fe 2+ ) 4 AlSi 8 O 22 (OH) 2
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Several minerals with a fibrous habit that have useful economic properties (flexible, high melting points, tensile strength, heat resistance) Asbestos Minerals Amphibole Asbestos minerals: Anthophyllite, Tremolite, Amosite, Actinolite, Crocidolite Serpentine Asbestos minerals: Clinochrysotile, Orthochrysotile Crocidolite (“blue asbestos”) is part of the Riebeckite series and is the worst of the asbestos minerals (at least according to legal websites) http://www.earthsci.unimelb.edu.au/Thomas/lteng/engeimg/enge0247a.JPG
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Today’s Agenda Phyllosilicates Part 1 1. General chemistry/structure 2. Phyllosilicate classification 3. Mica, chlorite and talc groups
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Phyllosilicates Si:O ratio = 2:5 (3 shared oxygens)
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Si:O ratio = 2:5 (3 shared oxygens) Anion component: Si 4 O 10 -4 or Si 8 O 20 -8 With Al substitution: AlSi 3 O 10 -5 or Al 2 Si 2 O 10 -6
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302-pp23 - Mineral Quizzes Results Quiz 8:...

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