METALS. 84. Cuprum. 265 



with fometimes a tinge of red : texture compa£V, very brit- 

 tle, and when rubbed emitting the fmell of arfenic : it con- 

 iilts of copper, iron, arfenic, fulphur, and fometimes a little 

 fi.vtr. 



purpifeum» Hardifh, with metallic luftre, brittle, red or blue. 



Cuprum pyriticofum. Sy/i. nat. xii. 3.^. 144. n. 5. 



Cupr. lulph. et ferro. Wall.Jyft, 2. />, 278. n. 5. 



Purple Copper ore. Kir fw an miner . 2. p* 142. 



Variegated Copper ore. Schmeiffer min. 2. p, 147, 



Purple Copper ore. Ihomjbn chem. 4. p^ 40. 

 • Found in America ^ Siberia, Lapland^ Nor<way, Sazony, Germany ^ 

 &c. generally mixed with other ores of copper, in mafTeSi 

 plates, or difl'eminated : colour copper-red, brown, purple^ 

 azure, blue or green; flrcak reddifh and metallic : texture 

 conchoidal, hrittle: with nitric acid it effervefces and tinges 

 it green, defiagates with nitre, and melts before the blow- 

 pipe with fmcll, fmoke or vapour : fpecific gravity from 

 4,956 to 4,985 : contains copper 58, iron 18, fulphur 19* 

 oxygene 5. Klaproth, 



cinereum* Hardifh, brittle, with metallic luftre, compaft, of a fteel- 

 grey colour. 

 Cuprum cincrt-um. Syfi. nat. xii. 3./). 144 n. 7, 

 Cupr. arfen. fulph. Wall. fyn. 2 p. 281. n 8, 

 Grey Copper ore. Kirivan mineral. 2. p. 146. 

 Grey Copper ore Schmei/ser miner. 2 p. 148, 

 Grey Copper ore. Thomfon chem. 4. ^.41* 



Found in Cornnjoall, Saxony y Hungary, Siberia, Germany , &c« 

 fometimes amorphous, iometimes in 4 fided cryftals with the 

 edges often truncated : colour fteel grey, often tarniftied or 

 variegated : ftrcak dark grey, often reddifh-hrown : powder 

 blackifh, with frequently a tinge of red : with nirre it defla- 

 grates, and melts with crackling before the blowpipe: it 

 tinges borax yellowifh or brownifh red : fpecific gravity 

 ^,864. contains wh n pure, copper 31,36, fulphur 11,50. 

 antimony 34,09. filvcr 14,77. ^^^^ 3'3°' alumina 0,30* 



Klaprof^, 



fcztidufn. Hard, with metallic luftre, of a lead colour, and con- 

 choidal texture, emitting a difagreeable fmell when 

 pounded. 

 Rehouanz 'v Altaifch Geh. p. 142. 



Found on the mountain Schlangenhurg in Biheria, and contains 

 45 per cent, of copper and a little lilver, 



psittacinum* Ponderous, dull parrot- red, radiated, breaking into fplin- 

 ters, often forming crufts. 



VOL. VIL — LI 



