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aggregates aluminum angles antimony apatite aragonite arsenic atoms axes axis barite basal pinacoid blowpipe blue borax brown calcite calcium called carbonate cerussite chalcopyrite charcoal chemical chloride cleavage cleavage parallel closed tube color Colorless common mineral commonly Composition compounds copper corundum crystalline crystals cube cuprite deposits diamond dipyramid dodecahedron easily elements faces feldspar fibrous flame fluorite fragment fuses galena garnet goethite gold granular gray green gypsum Habit hardness heated hematite hexagonal hydrochloric acid important iron isometric limestone luster luster is vitreous magnesium magnetic magnetite manganese masses massive metallic mica mined mineralogist monoclinic nonmetallic Occurrence octahedron orthoclase orthorhombic oxide pegmatites perfect cleavage Physical Properties plane platinum prism prismatic pyrite pyroxene quartz rare rhombohedral rocks salt scratched shown in Fig side pinacoid silicate silver sodium specific gravity specimens sphalerite streak substance sulfate sulfide sulfur surface symmetry tetragonal tourmaline triclinic twinning usually variety yellow zinc