...B. SERPENTINE, OPHICALCITE, VERD ANTIQUE MAiißLE. (1) COMPOSITION, ORIGIN, AND USES OF SERPENTINE. Serpentine is essentially a hydrous silicate of magnesia,...containing frequently from 10 to 12 per cent, of iron protoxides, together with varying quantities of chrome iron (chromite), iron pyrites, hornblende, olivine,...

...B. SERPENTINE, OPHICALCITE, VERDANTIQUE MAiißLE. (1) COMPOSITION, ORIGIN, AND USES OF SERPENTINE. Serpentine is essentially a hydrous silicate of magnesia,...containing frequently from 10 to 12 per cent, of iron protoxides, together with varying quantities of chrome iron (chromite), iron pyrites, hornblende, olivine,...

...B. SERPENTINE, OPIHCALCITE, VERB ANTIQUE MAiißLE. (1) COMPOSITION, ORIGIN, AND USES OF SERPENTINE. Serpentine is essentially a hydrous silicate of magnesia,...purposes are always more or less impure, containing freqnently from 10 to 12 per cent, of iron protoxides, together with varying quantities of chrome iron...

...B. SERPENTINE, OPHICALCITE, VERB ANTIQUE MAitBLE. (1) COMPOSITION, ORIGIN, AND USES OF SERPENTINE. Serpentine is essentially a hydrous silicate of magnesia,...equal proportions of silica and magnesia with from J2 to 13 per cent, of water. The massive varieties quarried for architectural purposes are always more...

...shown in the series illustrating the origin of serpentinous rocks. Serpentine, it should be remembered, is essentially a hydrous silicate of magnesia, consisting,...12 to 13 per cent, of water. The massive varieties occurring in nature are, however, always more or less impure, containing frequently from 10 to 12 per...

...magnesia with from 12 to 13 per cent, of water. The massive varieties occurring in nature are, however, always more or less impure, containing frequently...chrome iron (chromite), iron pyrites, hornblende, oliviue, minerals of the pyroxene group, and the carbonates of lime and magnesia. Tha reason for this...

...often sufficiently abundant to constitute rock masses. Pure serpentine consists of about equal parts of silica and magnesia, with from 12 to 13 per cent, of water. It is a compact, amorphous or colloidal rock, soft enough to be cut with a knife, of a slight greasy...