Manual of Mineralogy

abundant acid affords alumina angles antimony appearance arsenic becomes beds bismuth blende blowpipe blue brittle brown called carbonate cent characters charcoal clay cleavage coal cobalt color common Composition compound consists contains copper copper pyrites crystals dark distinguished easily edges faces feldspar fibrous figure flame furnace fuses galena garnet gives glass globule gold grains granite granular gray green hardness heated inches iron latter lead less light lime limestone localities luster magnesia magnetic manganese masses massive material metal mica miles mineral mines native nearly nickel obtained occurs opaque oxyd oxygen potash pounds present prisms proportion protoxyd pure pyrites quartz reduced resembles rhombic rocks salt serpentine silica silver slate soda sometimes South spar species specimens stone streak structure sulphur sulphuret surface tourmaline translucent transparent United usually variety veins vitreous weight yellow yield zinc