Rudimentary Treatise on Mineralogy

abundant acid afford albite alumina angles antimony appearance arsenic augite basalt beautiful beds bismuth blowpipe blue bright brilliant brittle brown calcspar called carbonate cavities cent cerium clay cleavage cobalt colourless combined compact consists contains copper Cornwall crystalline crystals cubes dark diamond distinguished earthy edges embedded felspar fibrous fluorspar fracture fusible garnet Genus glass gold grains granite granular green colour grey hardness heated hexagonal hornblende intermixed kind laminæ lavas lead lime limestone magnesia manganese marble masses metallic lustre mica mineral mines native nearly obtained occurs octahedrons opaque oxyde oxyde of iron pale pebbles planes porphyry potash powder pyrites quarried quartz rare resembles rhombic prisms rhombohedron rocks salt sand sandstone Saxony silicate silver slate soda solid soluble sometimes specific gravity specimens stone structure substance sulphate sulphur sulphuret surface tellurium texture thin topaz tourmaline translucent transparent variety veins vitreous yellow yellowish zeolites zinc