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Peridot 153
sreen
leaf. Hyalosiderite, " Job's tears," is a highly ferruginous variety;
specific gravity attaining 3.57; colour, a rich olive green.
Olivine
is a frequently occurring constituent of some eruptive rocks, is also
found in granular limestone and dolomite, and in several schists and
ore deposits. Chemically, olivine—a sample specimen—is composed of,
approximately, silica, 41; magnesia, 50; iron oxide, 9.
Olivine
is a constituent of meteorites. The sources of supply of this somewhat
puzzling mineral are characteristically doubtful. Dr. George Frederic
Kunz is quoted as saying that our modern supply of chrysolite is taken
out of old jewelry. The large transparent pieces of chrysolite used for
gem purposes are reported to originate in the Levant, Burma, Ceylon,
Egypt, and Brazil. Recently a limited supply has come into the market
from upper Egypt near the Red Sea—perhaps an ancient source. The
chrysolite of the Bible may have been topaz. Small chrysolites—" Job's
tears "—of good quality are found in the sand with pyrope garnet in
Arizona and New Mexico.
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