demantoid
(diːˈmæntɔɪd)
[a. G. demantoid.]
A green variety of andradite having a brilliant lustre.
| 1892 Dana Syst. Min. (ed. 6) 442 Demantoid is a grass green to emerald-green variety [of garnet] with brilliant luster. 1897 Edin. Rev. Oct. 346 The demantoid or Bobrovka garnet. 1957 Encycl. Brit. X. 29/2 The grass green demantoid is used as a gemstone and possesses high refractive and dispersive power. 1971 Materials & Technology II. viii. 519 By far the most valued garnet at the present time is the brilliant green demantoid. |