METALS. 99. Titanium. 311 



sulphursum, Hardldi, very ponderous, black, compad, fhining inter- 

 nally. 

 Uranites fulphuratus. Klaproth chem* annal 1789. 2. p. 403. 

 Pcchblcnde. Werner Bergman Journ. 1 789. \.p% 584, 

 Sulphurated uranite. Kirnvan miner, z. p. 305. 

 Sulphurated uranit. Schmetfser min. 2. /. 275* 

 Pechblende. Thomfon chem. \ p. 118. 



Found at 'Johanngeorgenfladt in Saxonyy either forming entire 

 thin ftrata alternating with other ftratified minerals, or maf- 

 five and difperfed : colour black, dark giey, or bluifli- black, 

 with a darker ftreak and opake black powder; texture con- 

 choidal, very brittle : imperfeflly loluble in fulphuric and 

 muriatic acids, but perfeftly in nitric and nitro-muriatic 

 acids, giving the folution a vinous yellow: forming a grey 

 opake flag with borax and (oda, and a green glafs with mi- 

 crocofmic fait: fpecific gravity 6,378 to 7,500 : contains, 

 uranium 86,5 : fulphuret of lead 60: fihca 5,0: oxyde of 

 iron 2,5, Klaprctb, / 



99. TITANIUM. Orange-red, very hard, in mi- 

 nute agglutinated grains, fpecific gravity : 



not fufible by any known heat, but when expofed 

 hot to the open air forming a blue or purple 

 oxyde : precipitating a white powder when its 

 cryftals or red oxyde are fufed in 4 times their 

 weight of potafs, and the whole diflblved in 

 Water. 



Menacku" In fmall irregularly fhaped grains, black, eafily pulverifed 

 mta* and the powder attradled by the magnet. 



Menackanite, Kirivan miner, z. p. 326. 

 Menackanite. CrelPs annals, \\\, p. 252. 

 Menackanite. Thomjon che7n. \. p. 122. 



Found in the valley of Menackan in Corn^waU, in fmall grains 

 refembling gunpowder of no det rmin^te fhape, and often 

 mixed with fine grey fand : it d 'CS not de-^ouate with nitre, 

 but melts with two parts of fixed alkali into an t. live coloured 

 maf , fr'-'m which nitnc acid prec'pitares a white powder, 

 and this powder mixed witii di'uted fu'p' u ic at id fo that 

 the m4b he n< t too liquid, and evaported tod ynefs, pro- 

 duces a blue mafs: bef.re the blowpipe it doe-^ not decre- 

 pitate, but with microcofmic fait it acquirci a greeniih tinge 



