The Mineral Kingdom |
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acid aggregates amount angle anhydrite aragonite augite axes axis barytes basal plane blue Brauns calcite calcium carbonate carnallite cavities cent chalybite chloride colour colourless combination contains copper copper-pyrites corundum crystal in fig crystal shown crystals cube cubic cuprite deposits diamond edges embedded felspar fibrous fluor-spar formula Fritz Lehmann galena gold gypsum haematite Harz hexagonal Idocrase iron iron-pyrites known large crystals limestone limonite lustre magnetite malachite manganese masses material metallic mica mineral Mineral Kingdom mines monoclinic native occurs octahedron olivine oxide parallel plane of symmetry precious stones present prism prism faces prismatic pyramid quartz readily refraction represented in plate rhombic rhombic-dodecahedron rhombohedron rock-salt rocks rutile salt Saxony second order shown in fig silicate silver sodium solution sometimes specific gravity specimens Stuttgart Fritz Lehmann sulphur surface tetragonal tetrahedron text-fig topaz tourmaline transparent truncated twin-plane twinned crystals Ural Mountains Urals usually variety veins vertical prism whilst yellow zinc-blende