58 BUTTERMILCHERZ. 



Localities. Real de Minas de Tetala, de 

 Jonotla, in the intendance of Piiebla, in 

 Mexico, associated with Iron Pyrites. 



BUTTERMILCHKRZ, or BUTTERMILK SIL- 

 VER. An eartliy variety of Horn Silver 

 ( Kerargyrite ), met with at Andreasberg in 

 the Harz. According to Klaproth it is 

 composed of silver 24'64, muriatic acid 

 8-28, alumina 67-08 = 100. 



Name. After Mons. Bustamente, the dis- 

 coverer, 



Brit. Mus., Case 26. 



BuTYitiTE, Giocker. See Bogbutter. 



Byssolite or Byssolith, Hausmann. A 

 varietj^ of Actinolite, composed of fibres, 

 which are as many small elongated prisms, 

 terminating at their fine extremity in a 

 point. Colour azure-blue. Transparent. 

 Lustre pearly. S.G. 3-32. 



Analysis by Dufrenoy : 



Oxide of zinc . . . 26-98 

 Oxide of copper . . . 4-17 



Lime 29-69 



Water and carbonic acid . 39-16 



100-00 



BB on charcoal gives the reaction of zinc. 

 Effervesces briskly in acids. 



Name. From (^vra-os^Jlax, and A/foj, stone. 



Cabocle. The name in Brazil for a com- 

 pact brick-red mineral found in the diamond- 

 sand of the province of Bahia. It resembles 

 Jasper, but contains phosphoric acid, alu- 

 mina, lime, and water. Slightly scratches 

 glass. S.G. 3-194. 



BB whitens but does not fuse. 

 Dissolves in concentrated warm sulphuric 

 acid, leaving a white earthy residue, which 

 is soluble in excess of boiling acid, and pre- 

 cipitated by the addition cf water. 



Cacholong. a variety of Opal, closely 

 allied to Hydrophane, with which it is often 

 associated. It is nearly opaque, of a milk- 

 er bluish- white colour, dull externalh^ but 

 ■with a somewhat pearly lustre within. Ad- 

 heres to the tongue. S.G. 2-2. 



Analysis by Forchammer, from Faroe : 



Silica 95-32 



Potash 0-07 



Soda 0-06 



Lime 0-06 



CAIRNGORM or CAIRNGORUM. 



Alumina . . . . 20 

 Magnesia . . . .0-40 

 Water . . , . . 3-47 



99-58 



BB infusible. 



It occurs in loose masses on the banks of 

 the river Cach, in Bucharia, whence the 

 name Cacholong is said to be derived ; also 

 in the trap rocks of Iceland; in the Faroe 

 Islands, and in Greenland. It is also found 

 in Ireland, at Smulgedon, in Ulster; in 

 felspathic porphyry in the parish of Clog- 

 her, TjTone co. ; and at Barrack Mountain, 

 in the parish of Pomeroy. 



Cacoxene. See Kakoxene. Occurs in 

 extremely minute fibrous tufts, radiating 

 from a point. Colour yellow or brownish - 

 yellow. Lustre silky. Adheres to the 

 tongue, has an astringent taste, and an 

 argillaceous odour. H. 3 to 4. S.G. 3-38. 



It is supposed to be an Iron-Wavellite. 



Analysis by Steinmann, from Zbirow : 



Alumina 

 Peroxide of iron . 

 Phosphoric acid . 

 Lime . . . . 

 Silica • . . . 

 Water and fluoric acid 



10-01 

 36-32 

 17-86 

 0-15 

 8-90 

 25-95 



99-19 



BB acts like Wavellite, except that it 

 yields an iron reaction. 



Localities. On brown Iron-ore in the 

 iron mines of Hrbeck, near Zbirow, in Bo- 

 hemia, and may be distinguished from Kar- 

 pholite, which is found under similar cir- 

 cumstances, by its deeper tint. 



Name. The name is derived from x»xos, 

 bad, |svo?, guest, in allusion to the inju- 

 rious influence exercised by the phosphoric 

 acid it contains upon the iron extracted 

 from the ore with which it is found. 



Cadmium Sulfure, Dufrenoy. See 

 Greenockite. 



Cahoutchou Fossile, La 3fetherie. See 

 Elaterite. 



Cailloux du Rhin — DE Medoc. Po- 

 lished rolled pebbles of Rock Crystal. 



Cairngorm or Cairngorum. The pel- 

 lucid wine-yellow varieties of smoky Quartz 

 are called Cairngorm, or Cairngorum-stone, 

 after the name of the mountain in Inverness- 

 shire,where they are found. It is also common 

 thioughout the central group of the Gram- 

 pian Hills ; the crystals met with on the east 

 side of Loch Aven being pale and very clear, 

 while those from the west side are of a dark 

 brown colour. 



