ONYX, a black or white variety of chalcedony, usually in
alternating bands - VARIETY OF: Crypto-crystalline - USES:
Gemstone and ornamental stone. - COLOR: black and/or white -
HARDNESS: 7 - CLEAVAGE: none - CRYSTAL SYSTEM: none visible
(actual crystals are microscopic) - For natural Onyx mineral
specimens see our For Sale or Sold lists 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: - Agate is a banded variety (sometimes with
translucent bands) - Bloodstone is green with red speckles -
Carnelian is yellow - Chrysoprase is - Flint is generally black
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