302-pp22 - UNIVERSITY OF SOUTH ALABAMA GY 302:...

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GY 302: Crystallography & Mineralogy GY 302: Crystallography & Mineralogy UNIVERSITY OF SOUTH ALABAMA Lecture 22: Inosilicates 2 Amphiboles Lecture 22: Inosilicates 2 Amphiboles
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Last Time Class VIII Minerals: Inosilicates (part 1) 1. General Introduction to Inosilicates 2. Pyroxenes 3. Pyroxenoids
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Inosilicates The “chain” silicates come in 2 main “flavors” Single chains (Si:O = 1:3) (Pyroxene Group) (Pyroxenoid Group) Double chains (Si:O = 1:2.5) (Amphibole Group)
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Inosilicates (single chain)
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Inosilicates (single chain) Two major sub groups of pyroxenes are distinguished on the basis of crystal structure: 1) Orthopyroxenes (orthorhombic) 2) Clinopyroxenes (monoclinic) http://www.uwgb.edu/dutchs/GRAPHIC0/ROCKMIN/ATOM-STRUCT/PyroxChain.gif
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Inosilicates (single chain pyroxenes) General formula: XYSiO 3 or XY(Si,Al) 2 O 6 X [larger ions] = Ca 2+ , Na + , Fe 2+ and/or Mg 2+ ; rarely Zn 2+ , Mn 2+ , Li + Y [smaller ions] = Cr 3+ , Al 3+ , Fe 3+ , Mn 3+ Si:O ratio is 1:3 (octahedrally coordinated cations between SiO 3 chains produce orthorhombic or monoclinic symmetries) http://ruby.colorado.edu Monoclinic Orthorhombic
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Inosilicates (pyroxenoids) General formula: X 2 SiO 3 X [larger ions] = Ca 2+ , Na + , Fe 2+ and/or Mg 2+ Si:O ratio is 1:3 (larger cations force triclinic symmetry) http://ruby.colorado.edu
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Inosilicates (single chain) Orthopyroxene: orthorhombic minerals (5) Hypersthene, Enstatite, Ferrosilite, Donpeacorite, Nchwaningite Clinopyroxene: monoclinic minerals (18) Clinoenstitite, clinferrosilite, pigeonite, diopside, hedenbergite, spudomene Pyroxenoid: Triclinic minerals (lots) wollanstonite, pectolite, rhodonite
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Enstitite is actually one member of a continuous series suite of “orthopyroxene” (Enstitite-Ferrosilite). http://ruby.colorado.edu/~smyth/min/images/enstatite.gif Inosilicate Minerals (orthopyroxene) http://upload.wikimedia.org/wikipedia/en/4/42/Pyrox_names.png your textbooks “mineral” (p265) hyperstene Orthopyroxenes
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Inosilicate Minerals (clinopyroxenes) Clinopyroxenes There are more options for ternary plots as there is more variability in cation composition … and you are going to the phase diagram possibilities
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Today’s Agenda Class VIII Minerals: Inosilicates (part 2) 1. Amphiboles
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302-pp22 - UNIVERSITY OF SOUTH ALABAMA GY 302:...

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