lab7 - 2 , Fe 2 O 3 aggregate g,g Psilomelane (Ba,H 2 O) 2...

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GY 302: Crystallography and Mineralogy Lab 7: Class III: Oxides, Hydroxides Drawer 4 Your task today : The class III minerals , like the sulfides, are numerous and not always readily distinguishable on the basis of one or two diagnostic properties. There are also some varieties that you need to keep track of (more info for your mineral log books!) Mineral Formula System Specimen Quality Oxides Anatase TiO 2 Tetragonal f, f,g Bauxite Al 2 O 3 aggregate f,g(x6) Cassiterite SnO 2 Tetragonal f(x3),g,g Chromite FeCr 2 O 4 Isometric g(x6) Chrysoberyl BeAl 2 O 4 Orthorhombic g *Columbite (Fe,Mn)Nb 2 O 6 Orthorhombic g Corundum Al 2 O 3 Hexagonal g, g, g Cuprite Cu 2 O Isometric p,f,f,g,g Franklinite (Zn,Mn 2+ ,Fe 2+ )(Fe 3+ ,Mn 3+ ) 2 O 4 Isometric g(x3) *Hematite (v. BIF) Fe 2 O 3 Hexagonal g Hematite (v. earthy) Fe 2 O 3 Hexagonal g, g Hematite (v. Specular) Fe 2 O 3 Hexagonal g, g, g Ilmenite FeTiO 3 Hexagonal g(x5) Magnetite Fe 3 O 4 Isometric f, g,g *Manganese nodules MnO
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Unformatted text preview: 2 , Fe 2 O 3 aggregate g,g Psilomelane (Ba,H 2 O) 2 Mn 5 O 10 Monoclinic g, g Pyrochlore (Na,Ca) 2 Nb 2 O 6 (OH,O) Isometric f *Pyrolusite (v. dendrite) MnO 2 Tetragonal g Pyrolusite MnO 2 Tetragonal f(x3),g(x3) Rutile TiO 2 Tetragonal f, g, g Spinel MgAl 2 O 4 Monoclinic g Stibiconite Sb 3 O 6 (OH) Isometric f,f, g,g *Uraninite UO 2 Isometric restricted Zincite (Zn, Mn)O Hexagonal g, g, g Hydroxides *Bindheimite Pb 2 Sb 2 O 6 (O,OH) Isometric g,g Brucite Mg(OH) 2 Hexagonal g, g, g, Diaspore AlO(OH) Orthorhombic g Gibbsite Al(OH) 3 Monoclinic g,g,g Goethite FeO(OH) Orthorhombic f, g, g Limonite FeO(OH) aggregate f, g(x4) Manganite MnO(OH) Monoclinic f, g(x4) p-poor, f-fair, g-good Minerals labeled with an (*) will NOT be on tests or quizzes this year in GY 302 The next mineral quiz (oxides and hydroxides) will be in two weeks time...
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