252 
METALS. 82. Argentum. 
arseniacum. With a metallic fplendour, eafily melting and emittipS 
arfenical vapours. 
Werner Samml. pbyf natur. 1. p. St. 4. p. 454. 
Arfenicatcd fllver. Schmefser miner, z. p, .^2. 
Arlenicated native lilver. Kirmtan mineral, z. p, in. 
Arfenical filver. ^fhomfon chem. p. zj. 
Found in the mines near Andreajburg in Hercynia, fometimes ol 
a fteel-white colour and luftre and containing a little iro®’ 
fometiines pale ochre-yellow; its hardnef; is often co fidet' 
able, and then it is fibrous internally, fometimes it is fo 
as to be eafily cut with a knife and in cuived foliations- 
commonly found in round irregular lumps or cr\ llailizcd m 
6-fided prifms or pyramids; contains filver t2,75. 
44,25, arfenic 35,00. antimony 4,00. Klaproth. 
Molybdesna- With a metallic fplendour, in thin flexible plates. 
turn. 
Freberno-v. abi. petrop. 3. p. 267. 
Molybdenic filver ore. Schmeiffer mineral. 2. /. 51. 
Found ntzr Deutchpilfen in Hungary, in thin broad fhining plate-? 
placed one over the other, fometimes nearly an inch in thick- 
nefs, in grey alumina : it gives a grey ftreak to paper, 
has fomething the refemolance of common Molybdxnum ■ 
it has fometimes a little iron mixed with it, and uiually 
23 ounces of filver in a hundred weight. 
niitreum, Of a dark blueifli-grey colour, eafily rnelting and emitting 
during combuition fulphurous flames and vapoiiiS' 
opake, very ponderous, foft, tenacious. 
Argentum mineralifat. Syft.nat. xii. 3. p. 148. n. 3. 
Argen.. fulph niineralis. Wall. fyjt. 2. p. 329. «. 2. 
Sulphurated filverore. Kirnvan mineral 2. p. 1 15. 
Vitieous filver. Uchmeifter miner, z, p. 
Sulphnret of filver. Thomfon chem. 4, p. zb. 
Found in the mines of Siberia, Nor-xvay, Saxony, Bohemia, iK"' 
gary, Spain, and America, generally fuperficial and running 
like veins through other fulfils : colour deep lead-grey, 
ifti black, or Heel blue, with very little metallic lullre, and 
fometimes variegated on the furface ; its appearance is rarely 
malfive, but mott commonly in thin plates, granular, capil- 
lary, arborefeent, or cryftallized m cubes or in double 4 
6-ftceil pyramids: internally it has more of a metallic lultrc? 
is loft enough to bear impteffi ms like lead, and melts eaftlX 
into a vitreous mafs. It is one of the richeft ores of lilvC’ 
containing ufually 85 percent, of pure filver; fpecific gravit/ 
from 6,909, to 7,215. 
