WILUITE. 

 Alumina .... 27-94 

 Peroxides of iron and man- 

 ganese .... 20 



Lime 6 50 



Magnesia .... 3-81 



Potash 8-37 



Soda 1-45 



Water 8-Gl 



100-43 



BB whitens and becomes opaque from loss 

 of water. Fuses with intumescence to a 

 white enamel. 



Locality. Bathurst, Canada West 



Name. After tiie discoverer, Dr. Wilson, 

 of Canada, mineralogist. 



WiLUiTE. A name for Grossular, from 

 its occurrence near the river Wilui, in Si- 

 beria. See Garnet. 



WiSERiTE, Haidinger. A fibrous, silky, 

 and yellowish (or reddish) hydrated variety 

 of carbonate of manganese iDiallogke), oc- 

 curring at Gonzen, nearSarganz, in Switzer- 

 land. 



It is named in honour of D. F. Wiser, 

 Swiss mineralogist. 



WiSMUTGLANZ, Naumatin, ") Bismuth 



WisMUTHGLANZ, Werner, V Glance. See 

 Hausmann. J Bismuthine. 



WiSMUTH, German for Bismuth. Accord- 

 ing to i\iatthesius, Wismuth is a name used 

 by the old miners, because it flowers like a 

 beautiful meadow (Wiese-wiesmatt, Wies- 

 matte), vipou which flowers of various co- 

 lours are growing ; alluding thereby to the 

 iridescence of the metal. Koch considers 

 the name to be derived from the Arabic 

 wiss majaht, or that which melts as easily 

 as Storax. 



WiSMCTHBLEiERZ, Hausmaiin. See Bis- 

 muth Silver. 



WisMUTHOCHEE, Wcmer. See Bismuth 

 Ochre. 



WiSMUTHOXYD KoHLENSXURES. See 



Bismutite. 



WiSMUTHSiLBBEERZ, Selh. See Bismuth 

 Silver. 



WiSMUTHSPATH. See Bismutite. 



WiTHAMiTE, Phillips. A variety of Man- 

 ganesian-Epidote, occurring in transparent 

 and minute but brilliant crystals, radiating 

 from a centre, which appear of a carmine- 



Fig. 458. 



red colour in one direction, and of a pale 

 straw- yellow colour Avhen viewed at right 



WITHERITE. 407 



angles to the former direction and across 

 the prism. Lustre vitreous. Streak white. 

 H. 6 to 6-5. S.G. 3-i to 3-3. 



BB intumesces, and fuses with diflSculty 

 to a dark greenish-grey scoria. 



Not acted on by acids. 



Locality. — Scotch. Glencoe, in Argyle- 

 shire, both crystallized and massive, liiiing 

 small cavities in trap-rock (Jig. 458). 



Name. Named by Sir David Brewster 

 after the discoverer, Henry Witham. 



Brit. Mus., Case 35. 



WiTHERiT, Werner. Witherite, Dana, 



Fig. 459, 



Fig. 461. 



Fig. 4G0. 



Fig. 462. 



Phillips, Greg 8j- Lettsom, Nicol. Rhombic : 

 primary form a right rhombic prism. Oc- 

 curs in crystals, which are nearlj', if not 

 always, compound, and resembling the com- 

 mon form of Quartz, viz. six-sided prisms, 

 terminated by six-sided pyramids ; also in 

 globular, tuberose, botryoidal, stalactitic 

 forms. Also amorphous. Colour generally 

 white; sometimes greyish or greenish. 

 Translucent, sometimes transparent. Lustre 

 vitreous ; of fracture resinous. Streak white. 

 Brittle. Fracture uneven. Tasteless and 

 poisonous. H. 8 to 3-5. S.G. 4-29 to 4-35. 



Camp. Carbonate of baryta, or Ba C = 

 barj'ta 77-7, carbonic acid 22-3 = 100. 



BB fuses readily, forming a clear bead, 

 which becomes white and opaque on cool- 

 ing; on charcoal boils violently, becomes 

 caustic, and is absorbed. 



Soluble in 4304 parts of cold, and 2304 

 parts of boiling, Avater. 



Dissolves slowly and with slight effer- 

 vescence in dilute muriatic or nitric acid. 



Localities. — English. Alston Moor, Cum- 

 berland {fig. 461). Wolhope, Durham. Ar- 

 kendale, Yorkshire {fig. 459). Anglezarke, 

 Lancashire. Snailbeach lead mines, Shrop- 

 shire, Fallowfield, near Hexham, North- 

 umberland, in large and very perfect 

 crystals (fig. 462). Dufton Fells, West- 

 PD 4 



