29S " METALS. 93. Arfenicum. 



Found in the Nag'fag mine of Tranjylvania, diflemmated or 

 cryftallized in (mall 4-rided prifms: fradure in onedire6l\on 

 foiieted, in the other uneven: contains tellurium 44,75: 

 gold 26,75: lead 19.5c: filver 8,50: fulphur 0,50. 

 Kiaproth* 



hraSeatuzn* Between lead-grey and iron-black, in flexible plates or 6- 



fided tables, with very little metallic lulire. 

 Aurum brafteatum. GmeJ /ys/, nat. ^. p*^S^. «, ll* 

 FoUated Tellurium, ^homfon chem. 4. />. 99. 

 Found at Nagyag in Tronjyi-vania^ and is wrought for the gold 

 which it contains: it is {Soluble in acids with effervefcence : 

 fpecific gravity 8,918. contains lead 54,0: tellurium 32,2, 

 gold 9,0. riivero,5. copper 1,3. iilver 3,0. Klaproth. 



93. ARSENICUM. Bluifh-whke foon becoming 

 black and falling to powder in the air, foft, ex- 

 trennely brittle, fpecific gravity 8,310: fublim- 

 ing without melting in a moderate heat in a 

 white powder emitting a ftrong fmell refembling 

 garlic: its fublimed oxyde giving an acrid tafte 

 to water and turning vegetable blues red, when 

 dillblved in muriatic acid and a watery foiution 

 of fulphurated hydrogene be poured into it pre- 

 cipitating-a fine yellow powder. Arfenic^ 



nat$vum» Uncombincd, with metallic luftre, 



K Arfenicum nitivum. Cronft. miner. 237. 

 Native arfcnic, Birketihout fyn, p^zb%^ 

 Native arfenic. Kirnjoan miner* 2. /. 255. 

 Native arfenic. Schmeijfermin. z. p. z6z* 

 Native arfenic. Thomjonchem. Af p>ioo» 



1. Separating into fpherical incruftations. 

 Arfenicum nudum. Syji. nat. xii. 3. ^. 1 17. «. i. 



Arfenicum nativum. fVaU*JyJi* 2. p. 162. «, 3. 



2. With micaceous particles. 

 Sffi, nat, xii. 3./. 161. «, 2. 



3. Friable and porous. 



Svst. not. xii. 3. p. 117. «. 3. 

 WalL (yit, miner, Z*p* 1 61 , ». 2, 



