Page:Encyclopædia Britannica, Ninth Edition, v. 16.djvu/425

MINEKALOGY 407 432. CiiiLDREN^TE,2(Fe,Mn) 4 PVArP +15H-. P - P 2 . H Right prismatic. Polar edges 101 43 , 130 10 , middl usual form P, 2poo, ooPw (e, a, P, fig. 439). H. = 45 to 5; G.=318 to 3 3. Translucent; vitreous. Yellowish white to wine- or ochre-yellow. brown, or almost black. C.c. : 307 iron protoxide, 9 manganese protoxide, 14 5 alumina, 29 phos phoric acid, and 17 water. Tavistock, Crinnis and Callington (Cornwall). 433. EOSPHORITE (Fe, AIn) 2 Al, P +4H-. Right prismatic. P (p) 133 32 and 118 56 ; ooP (i) 104 19 ; oo Poo (a), ooPco (b), oo !>2 (</), |P (q), 2P2 (s) (polar edges 130 26 and 98 42 ) (fig. 440). Cl. macro- diagonal. H. =5; G. =313. Pale red. Vitreous. C.c.: 22 alumina, 7 4 protoxide of iron, 23 5 oxide of manganese, 31 5 phosphoric acid, 15 6 water. Fairfield (Connecticut). 434. LIROCONITE, OugA s + Al As + 24H-. Oblique prismatic, C 88 33 . ooP (d) 61 31 , P c oo (o) 74 21 (fig. 349). H. =2 to 2-5; G. =2 S to 3. Trans lucent ; vitreous or resinous. Azure- blue to verdigris-green; streak paler. C.c.: 36-6 protoxide of copper, 11 "9 Fig. 440 (sp. 433). alumina, 26 6 arsenic acid, 24 9 water. Redruth, Herrengrund in Hungary. 435. CHALCOPHYLLITE, Cu G As + 1 2H- . Hexagonal rhombohedral ; R 69 48 (fig. 441). Cl. basal, perfect ; sectile. H. = 2 ; G. =2 "4 to 2 "6. Transparent ; vitreous to adamantine. Pearly on OR (o). Emerald- to grass- and verdigris-green; streak pale green. Soluble in acids and ammonia. C.c.: Fig. 441. protoxide of copper 49 6, arsenic acid 18, water 32 4. Redruth in Cornwall, Saida in Saxony, Moldawa in the Banat. 436. URANITE, (Ca, &,) P + 8H. Right prismatic. ooP~90 43 ; P middle edge 127 32 . OP : P 116-14; OP : 2Poo 109 6 ; OP : 2? oo 109 19 (figs. 442, 443). Crys tals flat. Cl. basal, perfect; sectile. H. =1 to 2; G. =3 to 3-2. Translucent; pearly on OP. Sulphur-yellow to siskin-green; streak yellow. C.c. :15 5 phosphoric acid, 62 6 uranium peroxide, 6 1 lime, and 15 8 water. Fig. 442. Fig. 443. Cornwall, Autun and Limoges in France, Johann-Georgenstadt and Eibenstock in Saxony, Chesterfield in Massachusetts. 437. URANOSPINITE, (Ca, J? 2 )As -f 8H- . Right prismatic; quadrangular, scale-like crystals. Cl. basal, perfect. H. =2 - 3; G. =-3 45. Siskin-green. C.c. : lime 5 47, sesqui- oxide of uranium 59 18, arsenic acid 19 37, water 16 29. Neu stadtel. 438. URANOCIRCITE, (Ba, ) + 8H-. Yellowish green crystals, isomorphous with 437. Cl. basal. G. =3 53. C.c. : sesquioxide of uranium 56 86, baryta 14 57, phos phoric acid 151, water 14. Falkenstein in Voigtland. 439. CHALCOLITE, (Cu, tf 2 ) P + 8ff . Pyramidal. P middle edge 142 8 ; Poo 128 14 . Crystals OP, P, oopoo , Poo . Cl. basal, perfect ; pearly lustre ; brittle. H. =2 to 2 5; G. =3 5 to 3 "6. Grass- to emerald- or verdigris- green; streak apple-green. C.c.: 15 2 phosphoric acid, 61 uranium peroxide, 8 5 copper protoxide, and 15 3 water. Red ruth and St Austdl, Johann-Georgenstadt, Eibenstock, Schneeberg Bodenmais, Baltimore. 440. ZEUNERITE, (Cu, & 2 )A s + 8& . Pyramidal. P middle edge 142 6 . OP :P 109 57 . Crystals tabular. Cl. basal. H. =2 5; G. =3 53. Grass-green. Lustre pearly. C.c. : 77 oxide of copper, 55 95 sesquioxide of uranium, 14 water. Huel Gorland in Cornwall, Neustadtel, Joachimsthal, Zinnwald, Wittichen. 441. WALPURGITE, 5 Anorthic; in scaly crystals. Wax-yellow to pomegranate-red Adamantine to greasy. H. =3 5; G. =576. C. c. : sesquioxide of bismuth 60-4, sesquioxide of uranium 20 "4, arsenic acid 13 water 4 ;">. Neustadtel. 442. PLOMBGOMME, Reniform or stalactitic ; fracture conchoidal and splintery. H. - 4 to 4 5; G. =6 3 to 6 4. Translucent; resinous. Yellowish or greenish white to reddish brown. C.c.: 38 protoxide of lead, 35 alumina, 8 phosphoric acid, and 19 water; but with 2 chloride of lead. Poullauouen, Nuissiere (near Beaujeu), Georgia. COMPOUNDS OF PHOSPHATES, VANADIATES, AND ARSENIATES WITH HALOID SALTS. 443. APATITE, 3CaP +Ca(Cl, F). Hexagonal and pyramidal-hemihedric. P 80 26 . The most common forms are ooP (M); P2(); OP(w); T (x); the base OP seldom wanting (figs. 92, 95, 96, 97, 98). The crystals are short- prismatic or thick-tabular ; also granular, fibrous, or com pact ; fracture conchoidal or splintery ; brittle. H. = 5 ; G. =31 to 3 25. Transparent to opaque ; vitreous to resinous. Colourless and white, but generally light green, grey, blue, violet, or red. C.c.: phosphate of lime (89 to 92 3), with chloride (to 11) or fluoride (to 77) of calcium, or both. Dissemi nated in granite, gneiss, mica and hornblende slates, primary limestones, and trap rocks ; also in beds and veins. Sutherland, Ross, and Aberdeen, in granite and limestone ; Cumberland^ Devonshire, and Cornwall; in tin-mines in Saxony; Bohemia, St Gotthard, Tyrol; Kragerb in Norway, New York, Canada. 444. PYROMORPHITE, 3Pb :j Hexagonal ; P 80 44 . Crystals ooP, OP, with ooP2, or P (M, P, x, fig. 444), occasionally thicker in the middle, or spindle-shaped ; also reniform or botryoidal ; fracture conchoidal or un- p even. H. =3 5 to 4; G. =6 9 to 7. Translucent; resin- - ous or vitreous. Colourless, but generally grass-, pis tachio-, olive-, or siskin-green, and clove- or hair-brown, and scarlet (Leadhills). C.c.: 897 phosphate and 10 - 3 chloride of lead, but Avith to 9 arseniate of lead, to 11 phosphate of lime, and to 1 fluoride of calcium. Elgin, Wanlockhead, also Cornwall, Derby shire, Yorkshire, Durham, Cumberland, Wicklow ; Fig. 444. Przibram, Mies, and Bleistadt in Bohemia ; Berezoff, Phcenixville in Pennsylvania, and Mexico. 445. VANADINITE, 3Pb 3 +PbCl. Hexagonal; P 78 46 . Forms ooP, OP (o), P (z), 2P, JP(J*), ocP2, oo Pf, 2P2 (rig. 445). Transparent to opaque; resinous. Honey-yellow to reyish brown; streak white. H. =3; . = 6 8to7 2. C.c.: oxide of lead 70 83, vanadic acid 19 35, lead 7 2, chlorine 2 62. Wanlockhead, Windischkappel in Carinthia, Haldenwirthshaus in the Black Forest, Bolet in West-Got land, Berezovsk, Zimapan in Mexico, Cordoba in the Argentine Republic. 446. MIMETESITE, 3Pb 3 A s + PbCl. Hexagonal ; P 81 48 . Crystals ooP, OP, P (figs. 91, 444), or P, OP. Cl. P; fracture conchoidal or uneven. H. =3-5 to 4 ; G. =719 to 7 25. Translucent. Colourless, but usually honey- or wax-yellow, yellowish green or grey. C.c.: 907 arseniate and 9 3 chloride of lead; but part of the arsenic occasionally replaced by phosphoric acid. Leadhills, Huel Alfred and Huel Unity in Corn wall, Roughten Gill and Dry Gill in Cumberland, Beeralston in Devonshire, Johann-Georgenstadt, Zinnwald, Badenweiler, St Prix in France, Nertchinsk, and Zacatecas in Mexico. 447. WAGNERITE, Mg 3 P +MgF. Oblique prismatic, C 63 25 . ooP 57 35 . Cl. prismatic, and orthodiagonal imperfect; fracture conchoidal or splintery. H. =5 to 5 5; G. =3 to 3 2. Translucent or transparent; resinous. Wine- yellow and white. C.c. : 43 3 phosphoric acid, 11 - 4 fluorine, 37 6 magnesia, and 77 magnesium; but with 3 to 4 5 iron protoxide and 1 to 4 lime. Werfen in Salzburg. 448. TRIPLITE, (Fe, Mn) 3 P + RF. Oblique prismatic ; only granular. Cl. in two directions at right angles ; fracture conchoidal. H. =5 to 5 5; G. =3 6 to 3 8. Translucent or opaque; resinous. Chestnut- or blackish-brown; streak yellowish grey. C.c.: iron and manganese protoxides, with 33 phosphoric acid, and 7 or 8 fluorine. Limoges, Schlaggenwald.

Fig. 445 (sp. 445).