astrion

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

astrĭon, ii, n. [ἀστήρ],

a crystalline precious stone , found in India , considered by some a kind of sapphire , by others as our adularia , Plin. 37, 9, 48, § 132; Isid. Orig. 16, 13, 7.