A / astrĭon
noun greek

astrĭon

gen. ii · gender neuter · decl. 2nd
a crystalline precious stone; found in India; a kind of sapphire
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.