44 BISULPHURET OF COPPER. 



Camp. Bi4C3H4 = oxide of bismuth 90-28, 

 carbonic acid G.29, water 3-43 = 100. 



Anahjsis, from South Carolina, by Ram- 

 melsberg ; 



Bismuth .... 90-00 

 Carbonic acid . , , 6'56 

 Water 3-44 



100-00 



Melts on a burning coal, and is reduced 

 with effervescence to a metallic globule, 

 covering the coal with white oxide of bis- 

 muth. 



Soluble in muriatic acid, affording a deep 

 yellow solution. 



Localities. In small amorphous pieces at 

 Joachimsthal in Bohemia, with small long- 

 ish prisms of what are considered to be a 

 new carbonate of bismuth ; Johanngeorgen- 

 stadt and Schneeberg in Saxony, with 

 Iv'ative Bismuth ; near Hirschberg in Reuss 

 Voigtland, with Brown Iron Ore, Native 

 Bismuth, and Bismuth Glance; also, in the 

 gold district of Chesterfield, S. Carolina. 



Brit. Mus., Case 49. 



Bisui-PHURET OF CoppEK, CovellL See 



COVELLINE. 



BisuLPHUHET OF Iro-st, Thomson, See 

 Iron Pyrites. 



BiTELLUKET OP Lead, Thomson. See 

 Nagyagite. 



BiTELLURET OF SiLVER, Thomson. See 

 Hessite. 



BiTTERKALK, Hausmami. See Dolomite. 



BiTTERSALZ, Werner. See Epsomite. 



Bitter Spak, Pldllips, or Rhombspar. 

 The crystallized or large grained and easily 

 cleavable kinds of Dolomite. 



Hexagonal. Usually occurring in the 

 form of its primary crystal, an obtuse rhom- 

 bohedron, very nearly'allied to that of car- 

 bonate of lime. Colour greyish or yellow. 

 Lustre somewhat pearly. Semitransparent. 

 Very brittle: harder than Calc-spar. Cleaves 

 readily into rhombohedronsof thesame form 

 as the crystals. H. 3-5 to 4. S.G. 2-85 to 2-9. 



Fig. 5]. 



Comp. Ca C + Mg C = carbonate of lime 

 54-35, carbonate of magnesia 45-65 = 10, 

 but the latter is sometimes replaced by a 

 small proportion of carbonate of iron. 



BLACK BAND. 



BB not distinguishable from Calc-spar, 

 but it is more slowly soluble in acids, with 

 a very slight effervescence. 



Localities. — The finest and most trans- 

 parent crystals are found at Traversella 

 in Piedmont, at St. Gotthard ; and near Gap 

 in France. In England it is a common 

 mineral at many localities. 



Bitter Spath. See Batter Spar. 



BiTUME AspHAETE, Brochant. Bitume 

 DE Judeb, Rome de Plsle. See Asphalt. 



Bitume Elastique, Haiiy. See Elate- 



RITE. 



Bitume Glutineux, Haiiy, See Earthy 

 Bitumen. 



Bitume Liquide] Blanchatre, Haiiy. 

 See Naphtha. 



Eitume Liquide Brun ou Noiratre, 

 Haiiy. See Petroleum. 



Bitumen. Includes several distinct varie- 

 ties, as Earthy Bitumen, Compact Bitumen 

 or Asphaltum, Elastic Bitumen, Maltha or 

 Mineral Tar, Naphtha, Petroleum, includ- 

 ing Seneca or Genessee oil, &c. 



Brit. Mus., Case 60. 



M. P. G. Horse-shoe Case, Nos. 101, 102, 

 111 to 116. 



Bituminite, Traill. See Torbanite. 

 See also Cannel Coal. 



Bituminoses Holz. Bituminous Wood. 



Bituminous Coal. Softer than Anthra- 

 cite, less lustrous, and of a more purely 

 black or brownish-black colour. S.G. varies 

 from 1-14 to 1'5. The proportion of Bitumen 

 is very inconstant, varying from 10 to 60 per 

 cent., and the coal is termed Dry or Fat ac- 

 cording to the amount of Bitumen it con- 

 tains. There are several varieties of Bitu- 

 minous Coal, viz. Pitch or Caking Coal ; 

 Cherr}^ Coal, Splint Coal, FHnt Coal, Parrot 

 or Cannel Coal, Coking Coal, Brown Coal, 

 &c. 



Black Amber. The name given by the 

 Prussian Amber-diggers to Jet, because it is 

 found accompanying Amber, and, when rub- 

 bed, becomes faintly electric. It is cut into 

 various ornamental articles by the Amber- 

 diggers. 



Black Band. The most valuable kind 

 of Clay Iron.stone, from which the greater 

 part of. the Scotch iron has been made, since 

 its discovery by Mr. Mushet in 1801. Black- 

 band ironstone is distinguished from ordi- 

 nary Clay Ironstone by the large proportion 

 of carbonaceous matter which it contains. 

 It is found in the Upper Coal-measures of 

 Lanarkshire; also in those of South Wales : 

 Staffordshire ; and in Ireland, at Roscom- 

 mon and Clonmore. 



M. P. G. Principal Floor, Wall-cases, 51 



