18 - Orthorhombic minerals are Biaxial minerals...

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12/2/10 Orthorhombic minerals are Biaxial minerals: Barite (BaSO4) barite roses andalusite Chrysoberyl (BeAl2O4) olivine sillimanite (Beryl, Be3Al2(Si6O18) is hexagonal)
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12/2/10 Aragonite (CaCO3) orthopyroxene (enstatite, Mg2Si2O6) Calcite is hexagonal clinopyroxene (augite, Ca,Mg,Fe)2Si2O6) is monoclinic Orthorhombic minerals are Biaxial minerals:
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12/2/10 Monoclinic minerals are Biaxial minerals : Biotite Muscovite Hornblende Augite (clinopyroxene group)
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12/2/10 Gypsum (CaSO4) 2H2O K-feldspar (orthoclase and sanidine) Actinolite Tremolite (asbestos minerals) tal c
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12/2/10 Triclinic minerals are Biaxial minerals: Kaolinite Kyanite (andalusite and sillimanite are orthorhombic) K-feldspar (microcline) Plagioclase Wollastonite (CaSiO3)
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12/2/10 Orthorhombic Orthopyroxen e (Mg,Fe)2Si2O 6
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12/2/10
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12/2/10 Monoclinic Clinopyroxene (Ca,Mg,Fe,Al)2(Si,Al) 206
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12/2/10 plagiocla se
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12/2/10 plagiocla se
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12/2/10 plagiocla se repeated (multiple) twins three or more individuals twinned polysynthetic twin - if all successive comp. surf. --- parallel
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12/2/10
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12/2/10 Triclinic
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12/2/10
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12/2/10 Biaxial minerals have 3 indices of refraction--- n û , n°, 3 vibration directions X, Y, Z ° to each other These may or may not correspond with 3 crystallographic axes a, b, c Called biaxial because there are 2 directions in which light
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12/2/10 vibration // to X Y Z
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