Onyx

( ὄνυξ, a finger-nail). (1) A general name for the varieties of the agate which consist of alternate layers of white, brown, or black, greatly valued by the ancients for cameos. In the Christian symbolism the onyx typifies innocence and candour. (See Onicolo.) (2) The name has also been applied by the ancients to Oriental alabaster. (3) Onyx marble was a name given to Algerian marble from Oran, of which “pure white, brilliant red, golden yellow, and hues of green, with every variety of striation and flocculence, exist.” [See the Building News, xiv. 489.]