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BIWCITE. 269 SbSblP, antimony 75-89, oxygen 18-82, water 5 - 29. Analysis by Blum and Delffs:— Antimony . . . 75 - 83 Oxygen .... 19-54 Water .... 463 Arsenic .... traces Occurs massive, disseminated, investing otlier minerals, pseu- domorphous after antimonite, from the decomposition of which it results. Is found with antimonite at Losacio in Spain, Eelsobanya and Kremnitz in Hungary, Goldkronach in Bavaria, the Carmen mine near Zacualpan in Mexico, in Iluel Boys near Padstow, and near Port Isaac in Cornwall. 143. BRUCITE.— Brucite; Phillips, Beudant. Rhom- hoedrischer Kuphon-Glimmer; Mohs. Brucit; Plausmann, Haidinger. Rhombohedral. o in, a oil. FIG. 296. ao 90 o aa! 60 0 Cleavage, o, very perfect; a, traces. I'racturo scarcely observable, uneven. Semi-transparent... translucent. Lustre pearly. White, sometimes inclining to f? r ey and green. Streak white. Seetile, in thin leaves flexible. 11 = 20. G = 23...2-4. In the matrass yields water. Before the blowpipe intumesces and becomes opaque, but is infusible. Moistened with solution °f cobalt and ignited becomes red. Is easily and perfectly soluble in acids. Exposed to the atmosphere becomes dull, pulverulent, and combines gradually with carbonic acid. Mgll, magnesia 69'62, water 30'38. Analyses of brucite a from Hoboken by Bruce, b by Stro- meyer, c from Unst by Fyfe, d from Unst by Stromeyer, e bv U- Wurtz:— a b c d e Magnesia .... 70 68'34 69’76 66 67 C9'll Oxide of manganese . — O'64 — 1-57 — s 3
