perosclerite

[Pref. pyro-; Gr. skleros hard, and suff. -ite ( Min.); Ger. pyrosklerit.] Min.: An apple to emerald-green mineral, occurring with chonicrite (q. v.) in veins in serpentine, at Porto Ferrajo, Elba. Crystallization, orthorhombic or monoclinic; cleavage, basal. Hardne , 3; specific gravity, 2.74; luster, somewhat pearly; translucent. Composition: E entially a hydrated silicate of alumina and magnesia. pyr-o-scope, s . [Pref. pyro- , and Gr. skopeō =to see. An instrument, invented by Leslie, to measure the intensity of heat radiating from a hot body or the frigorific influence of a cold body. The instrument is like a differential thermometer, one ball being covered with thick silver-leaf; the other ball is naked and forms the pyroscope. to burn; pyr =fire.]