106 DOLOMITE FAMILY. Chemical Characters. It dissolves slowly, and with but feeble effervescence, in nitrous acid. Constituent Parts. Lime, 33.00 Magnesia, 14.50 Oxide of Iron, 2.50 Carbonic acid, 47.25 Water and Loss, 2.75 100 Klaproth, Beit. b. iii.\s. 303. "t. Gcognostic and Geographic Situations. It occurs in cobalt veins that traverse the first sand stone formation at Glucksbrunn in Gotha. 3. Brown-Spar, or Pearl-Spar. Braunspath, Werner. This species is divided into three subspecies, viz. Fo liated Brown-Spar, Fibrous Brown-Spar, and Columnar Brown-Spar.