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FTKOIitTSITE. 233 In powder soluble in hydrochloric acid with evolution of chlo rine. ■Mn, manganese 69-68, oxygen 30\3l. Analyses of braunite a from Eglersburg by Turner, b from Botnedalen iu Oevre-Tellemarken by Tonsager:— a b Manganese .... 67-44 ife 89'64 Oxygen 29-35 j? 1-57 Barytes 2 - 62 silica 645 "Water 0'95 • 2-06 In small attached and imbedded crystals, and granular masses. Is found in veins in quartzose porphyry with other ores of Manganese and baryte at Oehrenstoek, Eglersburg and Fried- richrode in Thuringia, at Schmalkalde and Leimbaeh in Manns- feld, and Streitberg near Neuenkirchen in Westphalia, with amphibolo at St. Marcel in Piedmont. 120. PYKOLTTSITE. — Pyrolusite; Dufrenoy. Prisma- tisches Mangan-Erz; Mobs. Weichbraunstein ; Ilausmann. Byrolusit; Ilaidinger. Prismatic. 011,010=68° 47'; 101,001=20° o'; 110,100=46° 50'. « loo, b oio, c ooi, d 101, m 110. no. 251. be 90° o' dc 20 0 ac 90 o ma 46 50 ha 90 0 mm' 86 20 c smooth, frequently rather uneven ; a, b, in striated parallel to their intersections with each other. Cleavage, m, a, b distinct. Fracture uneven. Opaque. Dark steel-grey...light Mon-black. Streak black. Brittle, n = 2 - 0...2'5. o = 4 J 7... 5 °. Is a good conductor of electricity. Infusible before the blowpipe. On charcoal in a strong heat becomes reddish-brown. In the outer flame imparts a violet polour to borax and salt of phosphorus, which disappears in the inner flame. Soluble in hydrochloric acid with abundant evolu tion of chlorine. •Mn, mangancso 63‘27, oxygen 30-7-3.
