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acids albite amphibole anorthic anorthite aragonite Artif augite axes B. B. fuses biaxial blue botryoidal brown calcite chalybite chloride Cleavage Colour colourless common containing copper Cornwall crystalline Cubic decomposed deeply striated developed Dispersion edges elongated epidote face of union felspar fibrous galena garnet gneiss granite granular green grey gypsum H.cl heat Hemimorphic hexagonal hornblende inclined intumescence iron Isomorphous light Lustre metallic Lustre vitreous masses mica mineral mines nearly Norway Oblique olivine opaque optic angle optic axis Orthoclase Orthorhombic oxide parallel hemihedrism penetration twins perfect plane of symmetry plate Pleochroism polarized poles prism pseudomorphs pyramids pyrites Pyroelectric pyroxene quartz reddish refraction resinous rhombic Rhombohedral rocks rutile schist serpentine silicates similar SiO2 soluble sometimes Streak tabular crystals temperature Tetragonal thin transparent to translucent uniaxial usually massive variety yellow yellowish zone