74 CHALILTTE, 



the rhombic system, the fibres, in his 

 opinion, being rhombic prisms, with the 

 obtuse and acute edges truncated. The 

 colour of this mineral is cochineal- and crim - 

 son-red. S.G. 5-8. 



Comp. Identical with Cuprite. 



Localities. English. — It is known by the 

 name of plush copper in Cornwall, and has 

 been found at Huel Gorland, the Consoli- 

 dated mines, Carharrack, Huel Prosper, and 

 Owen Vean ; also at the Bedford United 

 mines, near Tavistock. The present loca- 

 lities are South Huel Francis, and the 

 Phoenix mines. Irish. — Coosheen mine, 

 Skull, Cork. Foreign. — 'Rheinbreitenbach, 

 on the Rhine; Moldawa; and N. Tagilsk, 

 in Siberia. 



Name. From a:<^-^«9?5 copper, and ^j'f, hair. 



Brit. Mus., Case 17. 



Chalcotrichite is distinguished from Red 

 Silver-ore by its crystallization and accom- 

 panying minerals; from Cinnabar by its 

 colour, weight, and accompanying mine- 

 rals; from Red Antimony by its'^colour, that 

 of the latter being cherry -red. 



Chalilite, Thomson. Probably an im- 

 pure massive Thomsonite. According to 

 Kengott there are two species of Chalilite, one 

 of a deep reddish-brown, the other flesh-red, 

 and fusing BB with more difficulty than 

 the preceding to a white blebby glass. The 

 first is compact, with a slightly resinous 

 lustre, and a splintery fracture. Subtranslu- 

 cent to opaque. Streak yellowish, and a 

 little greasy. H. 4-5. S.G. 2-252. 



Analysis by Thomson : 



Silica ..... 3G-o6 

 Alumina .... 26-20 

 Peroxide of iron . . . 9-28 

 Lime ..... 10-28 

 Soda ..... 2-72 

 Water ..... lG-66 



101-70 



BB fuses with intumescence. 



Localities. In irregular veins passing 

 through trap, where it rests on the por- 

 phyry of the Sandy Brae district, in Antrim ; 

 also at Tudree Hill. 



Name. From X'^^'i, a flint, from its great 

 resemblance in appearance to flint. 



Chalk. An earthy variety of carbonate 

 of lime, generally white, soft, and pulveru- 

 lent, but varying much in hardness. 



Chalkanthit, v. Kobell. See Cyano- 



SITE. 



Chalkolite. See Chalcolite. 



Chalkosine, Beudant. See Copper 

 Glance. 



Fig. 103 



Fig. 104, 



Chalybite, Glocker. Sparry or Spa- 

 THOSE Iron, Carbonate of Iron, or Si- 

 derite. Hexagonal; occurs in obtuse 

 rhombohedrons (Avhose faces are occasion- 

 ally curvilinear) ; in acute rhomboliedrons, 

 sometimes perfect, or having the terminal 

 angles replaced; in six-sided prisms, in 

 octlihedrons, and in lenticular crystals ; 

 also striated and massive. Colour various 

 shades of yellow, passing into brown and 

 brownish-black on exposure to the atmo- 

 sphere or to heat. Externally shining, in- 

 ternally with a brilliant or pearly lustre. 

 Transparent, translucent, or opaque. Streak 

 yellowish-brown. Structure lamellar. Bi'it- 

 tle. Fracture uneven. Affects the magnetic 

 needle. H. 3-5 to 4-5, S.G. 3-7 to 3-9. 



Comp. FeC = carbonic acid 37-93, prot- 

 oxide of iron 62-07, = 100. As however it 

 often contains oxide of manganese, magne- 

 sia, and lime, its composition is better ex - 



pressed by the formula (Fe Mn Mg Ca) C. 



Analysis from Durham, by Thomson : 



Carbonic acid . . . 35-90 



Protoxide of iron . . . 54*57 



Protoxide of manganese . 1-15 



Lime 3*18 



Water . . . . .2-63 



97-43 

 BB alone infusible; blackens, becomes 

 more magnetic. Colours borax bottle-green 

 in the reducing flame, and in the oxidating 

 flame yellow. Soluble with difficulty in 

 nitric acid, and scarcely eff'ervesces, unless 

 previously pulverised. 



Localities. Nearly all the Styrian and Carin- 

 thian Iron is manufactured from Chalybite. 

 In those and the adjoining countries it forms 

 extensive tracts, traversing gneiss, extend- 



