metals. 82. Argentum. 
251 
^rutn. 
“ib. 
'‘aUitn. 
nrifnis- it melts very eafny, becomes purple on expofure to 
the fun and has a waxy Uiftre : the belt kind contains about 
t per cent, of filver, wlfich may be exwafted by (eparanng 
the fulphur and decompofing the remainder with foda, whici 
when mixed with it and expofed in a crucible to heat, com- 
bines with the acid, and leave, the filver in us pure ftate . 
fpecific gravi.y from 4 , 743 -. 
o^de of iron 6,00. muriatic acid zi.oo. fulphuric acid 
o 25. alumina 1,75- Kluproth. 
Malleable, duailc, with a metallic luflre, yellowilh, not 
wholly foluble in nitric acid 
Veltheim n, Ent, chem. 7. 73 - , , 
2\urifcrous native fi yer. Kir^an mineral z. p. I 09 ’ 
Auriferous filver. ‘Ihomfon chcm.\. p- 23- 
Found in the mountain Echtaxgenbtrg in Siber'^, and in the 
nvnes near Kongsberg in Nor-wav, of a yellowi£i-whue colour 
or that of pi'e brats; rarely iu foluary nialles, but gene- 
rally difieminated, or filiform, or reticular, or in fpangles; 
fpecific gravity above 1.0.60c: a fpecimcn from Norway 
examined by Dr. hordyce. contained filver 72. gold 28. 
It mav be eafily fcparated by dilTolving the mais in nitric 
acid, 'which decompofes the filver, leaving the gold un- 
touched. 
With a metallic Itiftre, tin-whitc, malleable, very hard, 
lamellar, not emitting ftilphunc norarfenicd vapours 
when burnt; leaving a white oxyde when adted on by 
nitric acid. 
Selb muiax. Berkbauk. 3 - ' 786 • n. 7 . p. i. 
AntimoTiated native filver. Kir^an mineral. 2 p. 1 14. 
Antimoniated filver ore. rbomjon chem. 4. p, 24. 
Found near Wtttkhen in the diftrift of <IurRenhurpJn irregular 
grains or lumps or kidney-form pieces, or cryftallized in irre- 
eu'ar 4 6 , or 8 -fided prifms which are ftriated longitudi- 
nailv colour white, texture laminar, fradure conchoidal : 
before the blowpipe the antimony evaporates in a grey Imoke, 
and leaves a brownifh fiag which tinges borax green : it gives 
a oreyifh. black powder, and does not decrepitate when heated; 
wfth^Quickfilver it amalgamates eafily without the afliftance 
of hea^ • it is not foluble in nitro-nniriatic acid, but may be 
be dillbived in boiling nitric acid, leaving a refiduum of 
abou 27 per cent, fpecific gravity from 94.406. to 
"o^ooD. contains in its purer ftate filver 84. antimony 16. 
Klaproth, 
I i 2 
