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Well polished precious stones display a decided lustre, which assists in determining their species.
The following is a list of some precious stones and their lustre:
Adamantine.--Diamond, zircon.
Resinous.--Garnet.
Vitreous.--Emerald, ruby, spinel.
Waxy.--Turquois.
Pearly.--Moonstone, opal.
Silky.--Crocidolite, quartz cat's-eye.
Metallic.--Hematite.
Greasy.--Olivine.
Some stones vary in lustre, from vitreous to pearly, etc. |
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Precious Stones Guide Vol 1
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