C 160 j 



carbonic acid, and a little copper ; found in Bo- 

 hemia. 



b. Sulphuret of Uranite; Sulphurated Uranite, 

 Pechblende; of an iron colour, brittle texture; 

 emits a fulphureous fmell expofed to heat. 



S. MOLYBDENA. 



MOLYBDENA, is of a fteel-grey colour, 

 very brittle ; 6 times heavier than water ; is only 

 found in nature combined with fulphur. It 

 melts eafily ; is volatile by moderate heat, effer- 

 vefces with alkali ; emits a fulphureous fmell when 

 treated with the blowpipe. 



a. Sulphurised Molybdena, or Molybdena mi- 

 neralifed by fulphur; confuting of the molybdic 

 acid and fulphur; it's matrix is feltfpar, litho- 

 marge, and quartz; found in Iceland, Sweden, 

 Spain, Saxony, France, Siberia; frequently in 

 rocks containing wolfram and tin ores. 



T. MENACHANITE. 



MENACHANITE, difcovered in the valley of 

 Menachan, in Cornwall, by Mr. Gregor; and fup- 

 pofed to conftitute a new metallic fubftance. 



a. Native Menachanite ; Menachanite alloyed 

 by iron ; found amorphous, or in grains, and in 

 irregular forms; of a grey, or dark colour; pon- 

 derous, and attra&able by the magnet. 



U. SYL- 



