pyrologist

[Eng. pyrolog (y); -ist.] One who studies or is versed in pyrology, or the laws of heat. pỹ-ről-o-gỹ, s. [Greek pyr =fire; suff. -ology.] The science of heat. pyr-o-lü-site, s. [Pref. pyro-; Greek louō -to wash, and suff. -ite ( Min.).] Min.: One of the most important of the ores of manganese. Crystallization, orthorhombic; frequently occurring ma ive to earthy, soiling the fingers. Hardne , 2-2-5; specific gravity, 482; luster, metallic; color, iron-black to steel-gray; streak, black; opaque; brittle. Composition: Manganese, 63-3; oxygen, 36*7=100; yielding the formula, MnO2: Extensively worked in many localities. Used in preparing oxygen gas, with which it parts at a red heat; and also in gla -making.