Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 179
always anhydrous. It isquite otherwise with those that are to be describedin this group. They show no indication of crys-tallization, and nearly always contain water. It is probable that their elements have never 158 PRECIOUS STONES. been either melted by the direct action of heat, ordeposited by… … Fig. 72.—The Great Geyser (Opals and Chalcedonies). natural phenomena of our own time sustain thisopinion. The boiling waters of the Iceland geysers—thatat irregular intervals are projected upwards some-times to the height of fifty yards into the air—areheavily charged with silica ; and this…
Precious stones · Diamonds · Gems
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