76 cherokine: • 



kotliigerz, or Goose-duiig-ore, has been 

 shown to be an impure Iron Sinter (Pitti- 

 citc), containing Silver and Arseniate of 

 Cobalt. It is the result of decomposition, and 

 not a distinct mineral. It occurs in irregular- 

 ly mammillated, translucent masses of a yel- 

 lowish green or olive colour. Shining, with 

 a resinous lustre, white streak and con- 

 thoidal fracture. H. 2 to 3. S.G. 2 3, 



Localities. Cornwall. Allemont in Dau- 

 phine', chiefly at the mines of Clausthal in 

 the Harz, where, when obtained in suffi- 

 cient quantit}', it is highly prized as an ore 

 of Silver. 



Name. From x'-ivc^fOT^d?, goosedung, and 

 XiQo;, stone. 



CHEROiaNE, The mineral so called by 

 Professor Shepard has been proved by the 

 analj-sisof T. Sterry Hunt, to be Phosphate 

 of Lead (Pyromorphite ), containing less 

 than 1 per cent, of a, Avhiti^h precipitate, 

 which may have been phosphate of lime or 

 alumina. 



Cherry Coal. Resembles Caking Coal, 

 but does not cake when burnt. 



Chert. The name frequently applied to 

 Hornstone, and to any impure flinty rock, 

 including the Jaspers. From itsgreat'^tough- 

 ness, which exceeds that of Flint, Chert forms 

 a good road material, and it is used largely 

 in the potteries. It occurs in tlie uppermost 

 beds of the Upper Creensand of the south 

 of England; also in the Purbeck and Port- 

 land foi-mations of Dorsetshire ; in the Car- 

 boniferous Limestone of Derbyshire and 

 Flintshire, and in Ireland. 



It differs from Flint in breaking with a 

 square splintery fracture, instead of a con- 

 choidal fracture. 



Brit. Mus., Case 22. 



3I.P.G. Horse-shoe Case, Xos. 733, 734 : 

 Upper Gallery, Wall-case, 42, Nos. 17 to 

 35a. 



Chessylite, Brooke §• Miller, Greg ^ Lett- 

 som. Oblique. Primary form an oblique 

 rhombic prism. Colour azure-blue passing 

 into Berlin-blue, in earthy varieties smalt- 

 blue. Transparent to opaque. Lustre vi- 

 treous. Yields easily to the knife. Streak 

 paler than the colour. Structure lamellar. 

 Brittle. Fracture conchoidal. H. 3'5 to 

 4-0. S.G. 3-5 to 3-8. 



Fig. 107. 



:::3 



CHEVEUX DE VENUS. 

 Camp. Carbonate of copper, or 2Cu C -F 



Cu H = oxide of copper 69-37, carbonic acid ii 



25-43, water 5-20 = 100. e 



Anali/sls from Chessy, by Phillips : 



Carbonic acid . . . 25-46 



Oxide of copper . . . 69-08 



Water 5-46 



100 00 

 BB decrepitates, turns black and yields 

 a globule of copper. 



Dissolves with effervescence in nitric acid. 

 Soluble in ammonia. 



Localities. — English. Cornwall, at Huel 

 BuUer, Jig. 108, and at many other mines. 

 East Tamar mine, Devonshire. Matlock, 

 &c., Derbyshire. Alston Moor, Cumber- 

 land. — Scotch. Wanlock Head, Dumfries- 

 shire. Leadhills, Lanarkshire.^/nVi. Aud- 

 ley mines, Cork co. Killarney. — Foreign. 

 Chessy near Lyons, in considerable abun- 

 dance, and in very beautiful crystals.* Si- 

 beria. Moldawa in the Bannat. Thur- 

 ingia. 



Brit. Mus., Case 50. 



M.P.G. Principal Floor, Wall-cases 2 

 (British); 16 (Foreign); 38 (Australian) ; 

 Case 11, (Burra Burra). 



Chessylite is probably a result of the de- 

 composition of other ores of Copper. It 

 generally occurs lining cavities in primary 

 and secondary rocks, and associated with 

 Malachite and Red Copper. Chessylite 

 forms a valuable ore of copper when abun- 

 dant. It is also used when pulverized, as a 

 pigment under the name of Mineral-blue, or 

 Mountain-blue ; but it is not of much value, 

 from its liability to turn green. 



Chesterlite. a variet}' of Felspar with 

 the constitution of Orthoclase. 

 Analysis by Smith ^ Brush : 



Silica . • . . . 65-17 

 Alumina .... 17-70 

 Peroxide of iron . . . 0-50 



Lime 0-56 



Potash 13-86 



Soda 1-64 



Magnesia . . . .0-25 

 Loss by ignition . . .0-65 



100-33 

 Locality. Chester, Delaware co., U.S. in 

 crystals, often on Dolomite. 

 Brit. j\Ius., Case 30. 



Cheveux de Venus. See Venus' Hair- 

 stone. 



* Hence the name Chessylite. 



