Archive image from page 692 of The cyclopaedia; or, Universal dictionary. The cyclopaedia; or, Universal dictionary of arts, sciences, and literature cyclopaediaoruni09rees Year: 1819 C O P P E R. and a lamellar fracture, are femi-trarifparent paffing into tranfparent. In hardnefs they are inferior to fluur fpar. Sp. gr. It is compofed, according to Chenevix, of 49 Oxyd of copper 14 Arfenic acid 35 Water 9 It is found in the fame mine as the preceding fpecies. Sp. 16. Foliated arfeniat of copper. Blattriges olivewrz of Werner. Its colour is olive-green, pafiing to oil and leek-green. It
Archive image from page 692 of The cyclopaedia; or, Universal dictionary. The cyclopaedia; or, Universal dictionary of arts, sciences, and literature cyclopaediaoruni09rees Year: 1819 C O P P E R. and a lamellar fracture, are femi-trarifparent paffing into tranfparent. In hardnefs they are inferior to fluur fpar. Sp. gr. It is compofed, according to Chenevix, of 49 Oxyd of copper 14 Arfenic acid 35 Water 9 It is found in the fame mine as the preceding fpecies. Sp. 16. Foliated arfeniat of copper. Blattriges olivewrz of Werner. Its colour is olive-green, pafiing to oil and leek-green. It occurs rarely maffive, and generally cryftallized in acute rhomboids and oblique quadrilateral prifms. The fiirfaces of the cryftals are fmooth and fhining. Internally' it is gliftening and fhining, with a diamond luftre. Its frafture is imperfcftly foliated. It is tranflucent paffrig into tranf- parent. It is fomtwhat herder than calcareous fp3r. Its component parts, according to Chenevix, are, 54 Oxyd of copper 30 Arfenic acid iC Water and mining. Internal, it h gliftening with a filky uf. tre. Its frafture is tine and diverging fibrous. It u opake, and moderately hard. It conGfts, according to Klaproth, Oxyd of copper 3 j 95 Phqfphoric acid It has hitherto been found only at Firneberg in Cologne, in white drufy quartz. Sp. 19. Sandy copper. Werner. Its colour is emerald-green, paging into leek and olive- green. It occurs maffive, difTeminated, and. criftnllized in extremely minute fix or four-fided prifms. The fur- face of the cryftals is fmooth and brilliant, and their fracture lamellar. The maffive variety is opake ; the cryf- tals are tranfparent. It is folt and ealily frangible. Sp. gr. Lefore the blow-pipe on charcoal, it tinges the flame of a bright green and blue colour, and a metallic globule re- mains behind. It is foluble in nitrous acid, without cfi'er- vefcence. The following are its contlituent parts, according to Proult and Klaprot
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