A glossary of mineralogy . he name frequently applied toHornstone, and to any impure flinty rock,including the Jaspers. From its great tough-ness, which exceeds that of Flint, Chert formsa good road material, and it is used largelyin the potteries. It occurs in the uppermostbeds of the Upper Creensand of the southof England; also in the Purbeck and Port-land formations of Dorsetshire ; in the Car-boniferous Limestone of Derb5-shire andFlintshire, and in Ireland. It differs from Flint in breaking with asquare splintery fracture, instead of a con-choidal fracture. Brit. Mus., Case 22. Hor
A glossary of mineralogy . he name frequently applied toHornstone, and to any impure flinty rock,including the Jaspers. From its great tough-ness, which exceeds that of Flint, Chert formsa good road material, and it is used largelyin the potteries. It occurs in the uppermostbeds of the Upper Creensand of the southof England; also in the Purbeck and Port-land formations of Dorsetshire ; in the Car-boniferous Limestone of Derb5-shire andFlintshire, and in Ireland. It differs from Flint in breaking with asquare splintery fracture, instead of a con-choidal fracture. Brit. Mus., Case 22. Horse-shoe Case, Xos. 733, 734:Upper Gallery, Wall-case, 42, Nos. 17 to35a. Chessylite, Brooke §• Miller, Greg §• Lett-som. Oblique. Primary form an obliquerhombic prism. Colour azure-blue passinginto Berlin-blue, in earthy varieties smalt-blue. Transparent to opaque. Lustre vi-treous. Yields easily to the knife. Streakpaler than the colour. Structure Fracture conchoidal. H. 3-5 to4-0. 3-5 to CHEVEUX DE Carbonate of copper, or 2Cu C + Cu H = oxide of copper 69-37, carbonic acid 25-43, water 5-20 =-100. Analysis from Chessy, by Phillips ;Carbonic acid . . 25-45Oxide of copper . . 69-08Water 5-46 100 00 BB decrepitates, turns black and yieldsa globule of copper. Dissolves with effervescence in nitric in ammonia. Localities.—English. Cornwall, at HuelBuUer, fig. 108, and at many other Tamar mine, Devonshire. Matlock,&c., Derbyshire. Alston Moor, Cumber-land.—Scotch. Wanlock Head, Dumfries-shire. Leadhills, ^/ris/j. Aud-ley mines, Cork co. Killarney. — 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. Itgenerally
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectmineral, bookyear1861
