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Aventurine, or Gold Stone

Fuse 10 grains scales of iron, 50 grains paste, and 5 grains protoxide of copper, until the copper is reduced to metallic form, then allow the mass to cool very slowly, so that the minute crystals of metal become equally diffused through it. By substituting oxide of chromium for the protoxide of copper, the stone appears brown, filled with minute gold spangles; or by using a less quantity of the FOILS. chromium, a greenish gray stone, filled with with certain transparent solutions or varnishes. green spangles, is produced.