250 



METALS. 82. Argcntum. 



(hoots up in a fiiruS-like form, and is then called Arhor' 

 Diun^: its folution is colourlel?, highly caullic, giving the 

 &in, hair, and almoft all animal fubflances an indelible 

 black colour J and wheii evaporated till a pellicle begins to 

 form on its fL;rfacc, it depofits on cooling tranfparent cryftals 

 of nitrate of filver, from which is made the cauftic marerial 

 called lapis infernalis or lunar cauHic'. if its precipitate by 

 lime-water be dried and vvafhed with a folution of pure 

 ammonia, it has a moft dangerous fulminating property, ex- 

 ploding moil violently on the fligheft touch or fridlion. This 

 powder is Atr^omimitdi fulminating poi.vder, 



lutjraceus. Without luftre, friable, in thin pellieies intermixed with 



fpar. 

 Born, ind.fcfs. 2 p. WO. Kirivan Z. p, 1 14. 

 Found in St. Gcorgc^s mine near Andreajburg: the pellicles are 



white, blue, or brownifh. 



nigrum^ Deep black, friable, ponderous, effervefcing with nitric 

 acid, and recoveirng at lad its metallic fplendour 

 when rubbed. 



Argentum fuliginofum. Syjt. nat. xii. 3./. 150. a. 9. 



Argcntam mlneralifatum. Wall. fyft. 2. /. 335. n. 6. 



Black filver. Kirn^van mineral. 2. p. 117. 



Black filver ore. ScbmeiJJer min, 2. p. 50. 



Black filver ore, Thomfon chem. 4. p. 26* 



Found in the filver- mines of vS/V/'/y, Britanny^ Saxony y Hungary ^ 

 and Bchemiat fometimcs covering other minerals as with a 

 coating, fometimes intcrfperfed in larger or lefs particles, not 

 unfrtquently in a pulverifed ftate : it commonly contains 

 fulphur, arfenic and copper, and fometimes a little iron. 



corneum. Ponderous, foft, malleable, without metallic luftre, fome- 



what diaphanous, eafily melting in the fire and eva- 

 porating at laft in a white fetid Imoke. 



Argentum diaphanum, Sy/t. nat, xii. 3. /. 148. n. 2, 

 Argent, acid. fal. mineralif. Wall.fiit. 2. /. 331. ». 3* 

 Corneous filver ore. Kir-wan mineral, z. p. 113% 

 Muriat of filver. Thomfon chem. 4. /. 30. 

 Corneous filver. ScbmeiJJer miner. 2. p. 56. 

 Found in the mines of Mexicoy Peruy Siberia^ Hungary^ Bohemia, 

 Saxonyy Germanyy 8cc, it melts before a candle like wax or 

 fuet, and before the blowpipe leaves fmall grains of pure 

 filver; foft and eafily cut with a knife: colour white, grey, 

 yellowifh, green, violet or brown: fomedmes it is found in 

 irregular msfles, fometimes in hollow globular pieces, or in 

 thin plates, or in a ilate of powder, or cryftallized in fmall 

 cubes or in accumulated flakes, or in a cicular, rarely capillary 



