METALS, 97« Molybdaenum. 309 



97. MOLYBDiENUM. BUiifh-crrey not tarnifli- 



ing, brittle, not magnetic, compoled of fcaly 

 particles cohering together, fpecific gravity 

 7,500: nearly ififufible, gradually becoming a 

 white volatile oxyde when heated, which with 

 borax forms a violet and with microcofmic fait a 

 a green glafs: partly i^ lub'cin fulphuricacid, and 

 giving the folution firft a green and then a blue 

 colour, 



vulgare. MOLYBDiENUM. 



Molybdaenum. Syst. vat. xii. 3.^ /. 121, ^» «• 

 Molvbdsna pu:a. Wall. fyjl. 2 p» 249, //. i. a. 

 Molybdenite. Kmuan mineral z f. "^ig, 

 Sulphurifed mol} bdacna. Schmetjfer miner ^ 2, p. 256. 

 Sulphuret of molybdsena. Themfon chem. 4. p. 117. 



found in France^ Spatn^ St we Jen y Saxony y ^'iheriat and I eland, 

 in gangues of felifpar, liih')marg. or qu*irr2, g^^nerallv ia 

 maflcs confiding of fmall grains agglutinated t^gethe*-, fome- 

 times crvftallized in 6-fided tables : colour lig' t lead-grey, 

 with fometimes a fhade of red j llreak bluifti grey, metallic; 

 powder blu]fh : f:<ft, opake, lla-ning the fingers, and feeling 

 a little greafy to the touch : texure hmellar, with the foli- 

 ations thin, incurved, and flightly flexible : with warm ni- 

 tric acid it effervefces, leaving a grey oxyde undiflblvLd: 

 before the blowpipe it evaporate^ in white fulphurous vapours; 

 fpecifi" gravity from 4,569. to 4,738 : contains, molybdaeoum 

 60, fulphur 49. Klafroth, 



