Hypertext Webster Gateway: "sardonyx"
From Easton's 1897 Bible Dictionary (easton)
Sardonyx
(Rev. 21:20), a species of the carnelian combining the sard and
the onyx, having three layers of opaque spots or stripes on a
transparent red basis. Like the sardine, it is a variety of the
chalcedony.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sardonyx \Sar"do*nyx\, n. [L., fr. Gr. ?. See {Sard}, and
{Onyx}.] (Min.)
A variety of onyx consisting of sard and white chalcedony in
alternate layers.
From WordNet (r) 1.7 (wn)
sardonyx
n : an onyx characterized by parallel layers of sard and a
different colored mineral
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