LSJ
(sc. λίθος), ου, ὁ, lignite, Orph. L. 474, Plin. HN 36.141, Dsc. 5.128, Gal. 12.203, Gp. 15.1.32.
jet, Solin. 22.11.
= ἀστράγαλος, cj. in Ps.-Dsc. 4.61.
(From Γάγας or Γάγγαι, a town and river in Lycia.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)