BUCHOLZITE. 



Chester Co., Pennsylvania, in Serpentine, in 

 veins from one to four inches in width, 

 which are coated on the outside with a lay 

 er of a greenish mineral resembling Chlo- 

 rite. The mineral is broad-foliated; folia 

 several inches square being easily obtain- 

 able, and either opaque silvery white, or 

 translucent to transparent. Occasionally 

 it has a fine roseate tint. Brucite, also, 

 forms veins in Serpentine at Swinaness, in 

 Unst, one of the Shetlands, where it is found 

 in aggregated, foliated plates of silvery 

 white colour, and translucent. On expo- 

 sure it absorbs carbonic acid from the air 

 and becomes white. 



This mineral was discovered and de- 

 scribed by Dr. Bruce of New York. 



Brit. Mus., Case 58a. 



BuCHOLZiTE, Brandes. A variety of Sil- 

 limanite of a whitish, greyish, orpalebroAvn 

 colour, and with a lustre approaching to 

 adamantine. Both Bucholzite and the Fi- 

 brolite of Bournon are generally in fibrous 

 masses, sometimes apjiroaching distinct 

 prisms, like those of Sillimauite. H. 6 to 

 7-25. S.G. 3-24. 



BUSTAMITE. 



Analysis by Hermann : 



Silica 36*97 



Alumina .... 21-84 

 Peroxide of iron v . . 10*19 

 Protoxide of iron . . 9*19 



Lime 21*14 



Carbonate of lime . .0*32 

 Water 0-68 



57 



Fig. 69. 



^ \ 



Comp. Sesquisilicate of alumina, or ^Al 



3 si = silica 37, alumina 63 = 100. 



Analysts from Faltigl, by Brandes : 

 Alumina .... 50*0 



Silica 46-0 



Peroxide of iron . . . 2*5 

 Potash 1-5 



100-0 



Localities. Bticholzite was originally ob- 

 tained from the Fassa-thal, in the Tyrol, and 

 described by Dr Brandes. It is also found 

 near the Queensbury forge at Chester on the 

 Delaware, and at other places in the United 

 States. 



Name. After Bucholz, the German chemist. 



Brit. Mus., Case 26. 



BuCKLANDiTE, Dufrenot/. A variety of 

 Pistacite or Epidote-proper, with much 

 general resemblance to Augite. Primary 

 form an oblique rhombic prism. Colour, 

 dark brown, nearly black. Lustre vitre- 

 ous. Opaque. Fracture uneven. Harder 

 than Augite, S.G. 3-51. 



100-33 

 Localities. Arendal, in Norwa}^ with 

 black Hornblende, Felspar, and Apatite ; 

 and differing from Thallite only in colour, 

 higher specific gravit}' 3-5 to 3*9, and by 

 dissolving in muriatic acid ; in minute but 

 very brillant crystals in the lavas of the 

 Laacher-See on the Rhine; Achmatowsk. 



This rare mineral was distinguished and 

 described by Levy, who named it after Dr. 

 Buckland. 



Brit. Mus., Case 36. 

 BuNTBLEiEKZ. See Pyromorphite. 

 Bui!<TER KuPFERKiEs, Hausmann. See 

 Erubescite. 



BuNTKOPFERERz, Werner. See Erubes- 

 cite. 



BuRATiTE, jBrow(5fn?ar^. A mineral close- 

 ly allied to, if not identical with, Aurichal- 

 cite : perhaps a mechanical mixture. Oc- 

 curs in radiated acicular crystals, or plumose 

 aggregations of a verdigris-green colour. 

 G. 3-3'2. 



Analysis by Delesse : 



Carbonic acid . . .21*45 

 Oxide of zinc . . . .^2*02 

 Oxide of copper . . . 29-46 



Lime 862 



Water 8*45 



100-00 

 Localities. Lining small cavities in Cala- 

 mine, at Loktefskoi, in the Altai mountains ; 

 Chessy near Lyons ; the copper mine of 

 Temperino in Tuscany; Fraraont in the 

 Tyrol. 



Name. Named by Delesse after M. Burat. 

 Brit. Mus., Case 49. 



Burning Galena. See Johnstonite. 

 BusTAMiTE, Brongniart. A greyish-red. 

 variety of Rhodonite, occurring in irregu- 

 larly disposed prismatic crystals, having at 

 times a somewhat fibrous structure ; almost 

 opaque. H. 7. S.G. 3-1 to 3-35. 

 ■ Analysis by Dumas : 



Silica 48-90 



Protoxide of manganese .36-06 



Lime 14-57 



Protoxide of iron . . . 0-81 



100-34 



