Page:Encyclopædia Britannica, Ninth Edition, v. 16.djvu/423

MINERALOGY 405 Heterozite. H. 5; G. =3 5. Opaque; vitreous or resinous. Dark violet or blue to greenish grey ; streak violet-blue or crim son-red. Contains more iron and less manganese than the above. Hureaux. 392. DICKINSONITE, 4(R 3 P 2 ) + 3H 2 . Oblique prismatic, C 60 30 . Crystals tabular. Cl. basal, per fect. H. 3 5 to 4; G. =3 34. Vitreous; pearly on cleavage. Olive- to oil-green, and grass-green; stri ak white. Transparent; brittle. C.c. : phosphoric acid 40, iron protoxide 127, manganese protoxide 25, lime 11 8, soda 66, water 3 8. Branchville (Con necticut). 393. TRIPLOIDITE, (Mn, Fe) 3 P 2 + H. J (Mn ) Fe) 2 . Oblique prismatic, C 51" 56 . Generally fibrous ; transparent ; resinous to adamantine. H. =4 5 to 5; G. =37. Yellowish-brown. C.c. : 48 45 oxide of manganese, 14 88 protoxide of iron, 32 "1 phos phoric acid, 4 - 1 water. Fairfield (Connecticut). 394. FAIRFIELDITE, R 3 P g + 2H 2 . Anorthic; usually foliaceous. H. = 3 5; G. = 3 15. White to straw-yellow ; streak white. Pearly to brilliant-adamantine on cleavage. Transparent; brittle. C.c : phosphoric acid 38 4, iron protoxide 5 6, manganese protoxide 15 6, lime 30, soda 7, water 10. Fairfield (Connecticut). 395. CHONDRARSENITE, In small grains. H. = 3. Yellow to reddish-yellow. Trans lucent ; brittle ; fracture conchoidal. Paisberg mines (Werrn- land). 396. REDDINGITE, Mn 3 P 2 + 3H 2 . Right prismatic. P; P2 ; ooPoo . H. =3 to 3 5; G. =31. Vitreous; rose-pink to yellowish white. Translucent; fracture uneven; brittle. C.c.: phosphoric acid 34 5, iron protoxide 5 43, manganese protoxide 46 - 3, lime 8, water 13 1. Branchville. 397. SCORODITE, Fe 2 As 2 + 4H 2 . Right prismatic. P with polar edges 102 52 and 114 40 . Crystals P (p), ooPoo (a), and ooPoo (b) also OP, JP (i), ooP (), 2?2 (a), oo P2 (d) 120" 10 , and 2Poo (m) 132 (fig. 4 27); also <:olumnar and fibrous. Cl. imperfect; brittle. H. =3 5 to 4; G. =3 1 to 3 "2. Translucent ; vitreous. Leek-green to greenish black, also indigo- blue, red, and brown. B. B. fuses easily, with arsenical odour, to a grey magnetic slag. Sol. in h. acid, to a brown solution. C.c. : 49 8 arsenic acid, 34 6 iron peroxide, and 15 6 water. St Austell in Cornwall, near Limoges in France, Schwarzenberg, Lolling in Carinthia, Brazil, and Siberia. 398. STRENCITE, Fe 2 i y 2 + 4H 2 . Right prismatic. P with polar edges 101 38 and 115 36 , mid dle edge 111* 30 . oof 2 (d) and oo Poo (r), P (P), OP (h), 2Poo (m) 48 (fig. 428). Cry- stals generally r, P, d; r do minant. Cl. r. H. - 3 to 4 ; G. = 2 87. Cherry-red. Translucent. C.c.: prot oxide of iron 43 18, phosphoric acid 37-42, water 19 4. Rock Bridge (Vir ginia). 399. DUFRENITE (Kraurite), 2Fe 2 P 2 4- 3H a . Right prismatic. ooP about 123. Spherical or reniform. Cl. brachydiagonal ; brittle. H. =3 to 3 5 ; G. =3 3 to 3 4. Trans lucent on the edges, or opaque ; shining or dull. Dirty leek -green or blackish green; streak siskin-green. C.c : 63 iron peroxide, 28 phosphoric acid, and 9 water. Westerwald, Hirschberg, and Limoges. 400 BERAUNITE, 5 Fe 2 3P 2 + 1 4H 2 . Occurs in small foliated and columnar aggregates. Cl. plane metallic pearly. H. =2 ; G. =2 878. Colour hyacinth-red to reddish brown ; streak dirty -yellow. C.c. : 54 5 peroxide of iron, 28 65 phosphoric acid, and 16 55 water. Bohemia, Scheibenberg in Saxony. Fig. 427 (sp. 397). Fig. 428 (sp. 398). 401. ELEONORITE, 3Fe 2 2 ., + 8H 2 . Oblique prismatic. C 48" 33 . Twin face the orthopinacoid. Cl. ooPoo. H. =3 to 4. Dark hyacinth-red ; streak yellovr. Vitreous to pearly. C.c. : 51 94 peroxide of iron, 31 88 phosphoric acid, 16 37 water. Eleonore mine near Bieber. 402. CACOXENE, 2Fe 2 P 2 + 12H 2 . Radiated tufts, of a brownish-yellow colour. H. = 3 to 4 G. =3 38. Sol. in h. acid. From the Hrbeck mine near Zbirow in Bohemia. 403. PHARMACOSIDERITE (Cube Ore), 4Fe 2 3As 2 -f 15H 2 . Cubic and tetrahedral ; usually ooQoo, with , or ooO. Brittle. SI H. =2 5 ; G. -=2 9 to 3. Cl. ooOoo. Semitransparent to translu cent ; adamantine or resinous. Olive- to emerald-green, honey- yellow, and brown ; streak straw-yellow. Pyro-electric. C.c. : 43 arsenic acid, 40 iron peroxide, and 17 water. Carharrack in Corn wall, Burdle Gill in Cumberland, Lobenstein in Reuss, Schwarzen berg in Saxony, North America, and the gold quartz of Australia. 404. CALAITE (Turquoise), 2(A1 2 )P 2 + 5H 2 . Massive, reniform, or stalactitic ; fracture conchoidal. H. -=6; G. = 2 6 to 2 8. Opaque or translucent on the edges ; dull or waxy. Sky-blue, greenish blue, rarely green ; streak greenish white. C.c. : 47 alumina, 32 5 phosphoric acid, and 20 5 water, but mixed with phosphate of iron and copper. Silesia, Lusatia, and Reuss. Oriental turquoise, in veins, at Meshed, near Herat ; in pebbles in Khorasan, Bokhara, and Syrian desert. Takes a fine polish, and is valued as an ornamental stone, but is destroyed by oil, and deteriorated by soap. 405. WAVELLITE (Lasionite), 3 A1 2 2P 2 + 12H, . Right prismatic. ooP 126 25 ; Poo 106 46 . Crystals ooPoo (P), ooP (d), Poo (o) (fig. 429) ; but generally small, acicular, and in radiated-hemispherical and stellate-fibrous masses. Cl. along oo P and Poo , perfect. H. = 3 5 to 4 ; G. <= 2 3 to 2 5. Translucent ; vitreous. Colourless, but generally yellowish or greyish, sometimes green or blue. C.c.: 38 alumina, 35 3 phos phoric acid, and 267 water; but generally traces of fluoric acid (2 per cent.). Shiant Islands and Glenooe in Scotland, Barnstaple, Rt Austell, near Clonmel and Portrush, Beraun in Bohemia, Amberg in Bavaria ; also in New Hampshire and Tennessee. Cceruleolactin, from Nassau, has two equivalents less of water. 406. VARISCITE, A1 2 P 2 + 4H 2 . Right prismatic ; reniform ; conchoidal fracture. H. = 4 to 5 ; G. = 2 34 to 2 38. Apple- and emerald-green ; streak white. C.c.: 32 - 4 alumina, 44 85 phosphoric acid, 2274 water. Messbach in Reuss, Montgomery county in Arkansas. ZepJuirovichite from Bohemia contains one equivalent more water ; Evansite from Hungary two equivalents more. 407. FISCHERITE, 2A1 2 P 2 + 8H 2 . Right prismatic. ooP 118 32 ; generally in crystalline crusts. H. =5; G. -=2 46. Grass- and olive-green. Vitreous lustre. C.c.: alumina 42, phosphoric acid 29, water 29. Nijni-Tagilsk. 408. PEGANITE, 2A1 2 P 2 + 6H 2 . Right prismatic. ooP 127". In thin reniform crusts, of fibrous structure. H. =3 to 4; G. =-2 49 to 2 "54. Grass- and emerald- green. Vitreous or greasy lustre. C.c. : alumina 45, phosphoric acid 31 3, water 237- Striegis in Saxony. 409. HOPEITE, Zn 3 P + 4H 2 . Right prismatic. ooP2 82" 20 ; P with polar edges 106* 36 and 1 40. Cl. macrodiagonal, perfect. H. = 2 5 to 3 ; G. - 2 76 to 2 85. Vitreous or pearly. Greyish white. C.c.: oxide of zinc 35 21, phosphoric acid 31 1, water 15 8. Altenberg. 410. ADAMITE, 4ZnAs 2 + H 2 . Right prismatic. ooP 91" 52 . Cl. macrodomic. H. =3 5; G. = 4 34. Lustre vitreous. Colour honey- yellow to violet ; streak white. Trans parent. C.c. : oxide of zinc 56 6, arsenic acid 40 2, water 3 2. Cape Garonne in f France, Chanarcillo in Chili. 411. LlBETHENITE 4CuP 2 + 6H 2 . Right prismatic. ooP (u) 92" 20 , P" oo (o) 109" 52 , and P (fig. 430). H. -4; G. =3 6 to 3 8. Translucent on the edges; resinous. Leek-, olive-, or blackish -green; streak olive-green. C.c. : 66 copper prot oxide, 30 phosphoric acid, and 4 water. Fig. 429. Fig. 430 (sp. 411).

Gunnislake (Devon), Libethen (Hungary), Nijni-Tagilsk.