302-1 - a = b = c" = $ = =90 ° Halite Galena Pyrite 2...

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GY 302 Crystallography and Mineralogy Supplementary Lecture Notes 1 Crystal Systems and Symmetry Bond Mineral properties Ionic -strong bond -high melting points -vitreous lusters -higher solubility Covalent - strong bonds - hard minerals - very high melting points - vitreous – adamantine lusters Metallic - weak bonds - low to high melting points - metallic lusters -electrically conductive
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Crystal System Axes Angles between axes Mineral examples 1 Cubic
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Unformatted text preview: a = b = c " = $ = ( =90 ° Halite, Galena, Pyrite 2 Tetragonal a = b ≠ c " = $ = ( =90 ° Zircon 3 Hexagonal a= a 1 =b ≠ c " = $ =120 ° , ( =90 ° Apatite 4 Trigonal a= a 1 =b ≠ c " = $ =120 ° , ( =90 ° Quartz, Calcite 5 Orthorhombic a ≠ b ≠ c " = $ = ( =90 ° Aragonite, Staurolite 6 Monoclinic a ≠ b ≠ c " = $ =90 ° , ( ≠ 90 ° Gypsum, Orthoclase 7 Triclinic a ≠ b ≠ c " ≠ $ ≠ ( ≠ 90 ° Plagioclase...
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302-1 - a = b = c" = $ = =90 ° Halite Galena Pyrite 2...

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