280 HYDROUS EARTHS, OXIDES, AXD ACIDS. Analysis of asbolane from Kamsdorf by Rammelsberg: Protoxide of manganese . . . 40-05 Oxygen 9-47- Oxide of cobalt 19-45 Oxide of copper 4-35 Red oxide of iron 4-50 Barytes 0 -so Potash 0'37 Water 2 1'24 _ Occurs massive, mammillary, botryoidal and pulverulent, investing other minerals. Is found at Kamsdorf, Saalfeld, Gliichsbram in Thuringia; Bieber and Riechelsdorf in Hessia; Wittichen in the Black Forest; Eengersdorf in Lusatia ; in the mines of Mauknerdtz and Geyer near Brixlegg in Tyrol; Nertschinsk in Siberia ; in sandstone with copper pyrites at Alderley Edge in Cheshire • of a blue colour, investing fissures in slate'clay in the peninsula 01 FLowth near Dublin. 154. PSILOMELA XE.—Psilomelane ; Beudant. Untheil- bares Mangan-Erz ; Mohs. Schwarzbraunstcin ; Hausmann. Psilomelan; Haidinger. Amorphous. Fracture even...flat conchoidal. Opaque. Lustre metallic, imperfect. Blueish-black, greyish-black...dark steel-grey. Streak brownish-black, shining. Brittle, h = 5-0 ...CO. g = 3'7...4-4. Is a good conductor of electricity. In the matrass yields water. Its reactions before the blow pipe are the same as those of manganite. In powder soluble in hydrochloric acid with an abundant evolution of chlorine. In powder imparts a red colour to concentrated sulphuric acid. After ignition, the potash which some varieties contain may bo dissolved out by water. Analyses of psilomelane a from Schneebcrg, b from Ro- maneche, both by Turner, c from Baireuth by Fuchs, d from Horhausen by Rammelsberg, e from Ilmenau by Scheffler: — Red oxide of manganese MnMn. Oxygen Barytes Potash Water Silica Black oxide of coj per a b C d e 69'80 70'97 81'8 81'36 83-3 7'30 7'20 9'6 9-18 9-8 16'30 16'69 — — 6-8 — — 4'5 3-04 — 6'22 4'13 4'2 3-39 43 0'26 0'95 — 0-64 1-7 — — — 0-96 —
