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Onyx is a cryptocrystalline form of quartz. The colors of its bands range from white to near every color. Usually, versions of onyx available contain bands of colors of white, brown and tan. Sardonyx, is a variant in which the colored bands are shades of red rather than black. Completely black Onyx is common, but it is not as common as Onyx with banded colors, although it may just be the most famous variety. Onyx is also the alternate birthstone of February.

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