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Jade. "Jade" should next receive attention. It is a much abused term. Under it one may purchase jadeite, nephrite, bowenite, amazonite, or frequently simply green glass. The use of the word ought to be confined to the first two minerals mentioned, namely, jadeite and nephrite, for they only possess the extreme toughness together with considerable hardness that we expect of jade. Bowenite, while tough, is relatively soft and amazonite is brittle and also easily cleavable, while glass is both soft and brittle.
Peridot and Olivine. The mineral "olivine" gives us the "peridot" (this name should be kept for the deeper bottle green stones), and the olive green gems of this same mineral may correctly be called "olivine" or "chrysolite." As was explained under garnet, jewelers frequently use the term "olivine" to designate demantoid garnet. The term chrysolite is also sometimes incorrectly used for the greenish-yellow chrysoberyl. |
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Precious Stones Guide Vol 7
>> Naming Jade, Peridot, and Olivine Gems
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