chalcedonyxn.
Mineralogy.
A variety of agate: see quot. 1822.
ΚΠ
1822 P. Cleaveland Elem. Treat. Mineral. & Geol. (ed. 2) I. 270 When white and gray layers alternate, it is called Chalcedonyx.
This entry has not yet been fully updated (first published 1889; most recently modified version published online June 2019).
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n.1822