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Onyx
Gemstone
Onyx is the parallel-banded variety of chalcedony, a silicate mineral. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands; agate has curved bands while onyx has parallel bands. The colors of its bands... Wikipedia
Hardness (Mohs hardness scale): ≥ 7
Chemical formula: SiO₂
Birth month: July
Category: Chalcedony variety (silicate minerals)
Crystal system: Trigonal
Diaphaneity: Translucent
The Onyx Collection manufactures shower bases, shower pans, tub-to-shower conversions, lavatories, tub surrounds, fireplace hearths, slabs, seats, trim and ...