VARIETY INFORMATION:
Onyx is a black or white variety of chalcedony (cryptocrystalline quartz), usually with alternating bands. It is a fine-grained quartz whose crystals are too small to see. Onyx is popular as a carving stone, since clever use of alternating bands of black and white can create a highly appealing carving. Onyx is the traditional birthstone for February. It is associated with relaxation and comfort.
Onyx is only one of several chalcedony (cryptocrystalline quartz) varieties. The primary varieties are as follows:
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