adamantine spar

75 Min. [So called from its lustre.) The name given by Black and others to corundum from India. It is of a dark-greyish smoke-brown tint, but is greenish or bluish by transmitted light, that is, in specimens sufficiently translucent to admit of the experiment being made. When ground it is used as a polishing material. Dana cla ifies it with his anhydrous oxides. ad-a-măs, s. [Lat.] [ADAMANT.] ( Pliny, xxxvii. 15.) The diamond. [See ADAMANT and DIAMOND.] Adamas siderites. [Gr. σίδηρος ( sideros ) iron.] Pliny's name for corundum. ( Pliny , xxxvii. 15.) [CORUNDUM.] ( Dana .)