EARTHS. SILICEOUS. 49. Smiris. 157 



i^eolites partic, fubtilifl*. Wall.fy/i. \. p. 312. w. 3. 

 Lapis Lazuli. J^ir-wan miner. i./>. 283. 

 Lapis Lazuli. SchfiieiJJer mineraL i. />. 150, 

 Lazulitc. Thomfon cheniy 3. p. 561. 



Found in the confines of Siberia^ Tartaryy and Chinay in Ame^ 

 rica, and various parts of Europe^ generally in Iblid mafics, 

 and ufually full of veins of quartz, limellone and pyrites: 

 colour fky-blue, often with white or yellow fpots or veins : 

 if calcined it efKervefces a little with acids, and forms witii 

 them a gelatinaus mafs: it retains its colour a long time in 

 the fire, but at kll becomes brown : when boiled in con- 

 centrated vitriolic acid, it diffolvcs ilowly, and lofes its 

 colour. It is ufed for extracting that fine colour, called 

 ullrainarine, and is manufadured into various veilclf, and 

 ufed in Mofaic work. Specific gravity from 2,760. to 

 2,945. contains filica 46,0. alumina 14,5. carbonate of 

 lime 28,0. fulphate of lini&.6,5. oj:yde ,of iron 3,0. water 

 2,0. Margraf, 



49. SMIRIS. Confifting of alumina, filica, and a 

 large quantity of iron : very hard, of a common 

 form, opake, attra6led by the magnet, red when 

 powdered : not fufible per fe. 



Smiris, 



Ferrum retrafl. rubricof. Sjyji. nat, xii. 3./. 139. «. 17. 

 Ferr. mineralis. Wall.Jyst, min, 2. p, 343. n. 9. 

 Emery. Kirivan miner ^ Schmeijiermineral. 2. p. 85- 

 Emery. T^homfon fhem. 3./. 509. 



Found at GuernfeVy in Germany^ Italy y and Spaitij in the iflands 

 of the ArchitpelagOy but is ufually imported from the ille of 

 Naxosy always in fhapelcfs mailes, and mixed with other 

 minerals : colour greyifh-black, when reduced to powder 

 reddifli-grey : has a granular texture, and is fo hard as to 

 cut all ftones except the diamond, upon which account it is 

 principally ufed in the form of powder for polilhing metals: 

 fpecifiG gravity about 400, 



