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Chemical Analysis of Precious Stones

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THE CHEMICAL ANALYSIS OP PRECIOUS STONES. 411
GARNET.
Combination of a silicate of the protoxide of iron with silicate of alumina.
The native garnet (Almandine) is not electric by friction, but when polished and facetted I have found by experiment that it becomes highly so.
Native form : a rhombic dodecahedron, imbedded in mica-slate, and loose in the earth.
LAPIS-LAZULI.
OPAL.
PERIDOT: CHRYSOLITE.
Combination of magnesia, silica, and peroxide of iron.
Chemical Analysis of Precious Stones Page of 453 Chemical Analysis of Precious Stones
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