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affords albite alumina Analyses angles antimony apatite arsenic augite axes axis B.B. fuses basal BB fus BB on charcoal blue borax brittle brown calcite carbonate Cleavage cobalt Color colorless composition copper pyrites cryst crystalline crystals cube Damour Dimetric earthy edges epidote feldspar fibrous flame fluor foliated forms formula Fracture fumes galena garnet glass globule granular gray green heated hexagonal hornblende hydrous idocrase inclining intumesces iron Klaproth Kobell lime limestone Lustre vitreous magnesia magnetic manganese masses massive matrass mica mineral Monoclinic Monometric muriatic acid nearly nitric Observed planes occurs octahedron opaque oxyd oxygen ratio parallel peroxyd Pogg prism protoxyd pyroxene quartz Ramm Rammelsberg rhombic rhombohedron rocks salt scapolite serpentine silica silver soda soluble sometimes species specimens sphene Streak strl sulphate sulphuret Thomson tourmaline translucent transparent Trimetric variety vertical yellow yellowish
Seite 143 - Let a mass of matter be supposed to consist of spherical particles all of the same size, but of two different kinds in equal numbers, represented by black and white balls; and let it be required that, in their perfect intermixture, every black ball shall be equally distant from all surrounding white balls, and that all adjacent balls of the same denomination shall also be equidistant from each other.
Seite 98 - Is the projection of crystals, the eye is supposed to be at an infinite distance, so that the rays of light fall from it on the crystal in parallel lines. The plane on which the crystal is projected is termed the plane of projection.
Seite 12 - ... reduced to a manageable quantity the gold is amalgamated with clean mercury ; the amalgam is next strained to separate any excess of mercury, and finally is heated and the mercury expelled, leaving the gold.* In this way by successive trials with the rock, the proportion of gold is quite accurately ascertained.
Seite 148 - a flinty slate, black, grey or white,"8 but a "velvet black siliceous stone or flinty jasper used on account of its hardness and black color for trying the purity of precious metals. The color left on the stone after rubbing the metal across it indicates to the experienced eye the amount of the alloy.
Seite 168 - CD is the sine of the angle CED, which is the angle of refraction. This principle may therefore be thus stated : The sine of the angle of incidence bears a constant ratio to the sine of tlw angle of refraction.
Seite 167 - AE ; or, if we consider the ray as passing from the water into the air, the part, AE, is farther from the same perpendicular than if it had proceeded in the original direction DE. We have therefore this important principle : Light, in passing from a rarer to a denser medium, is refracted TOWARDS the perpendicular ; if from a denser to a rarer, it is refracted FROM the perpendicular.