LSJ
α, ον, name of a hard Rhodian stone, πέτρα SIG 581.98 (Hierapytna, iii/ii BC); λίθος IG 12(1).2.7, cf. 677.7, 1033.22; στάλα (i.e. made of such stone) Supp.Epigr. 3.674.9 (Rhodes, ii BC).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)