[ *°9 3 



emits a fmell ofliver of fulphur. Anal Sulphate 

 of baryte 38. Silex 33. Sulphate of argili 22, 

 Sulphate of lime 7. Petroleum 3 Bergman. 



D. MAGNESIA is never found naturally 

 pure, but generally combined with the fulphurie 

 acid, in the form of Epfom fait, fal amarus, or 

 fulphate of magnefia. 



a. Calci-murite, amorphous, earthy ; colour 

 blue or olive green; of the confidence of clay. 

 Anal. Silex 50. With carbonate of magnefia 

 and iron. 



b. Argillo-murite^ of a loofe earthy texture ; 

 greenifh yellow colour, confidence earthy. Anal* 

 Magnefia, 13. Silex 50. Argili 10. Lime 3. 

 Oxyde of iron 0,9. Water 13. Kirwan. 



c. Siliclmuritey Martial muriatic fpar, amor- 

 phous, foliated. Anal. Silex 50. With carbo- 

 nate of magnefia and iron* Kimvan. 



d Talc, Talcite, Venetian talc, or Shiftofe talc. 

 Generally of a greenifh or filvery white luftre, 

 like mother of pearl, foft and femi-tranfparent 5 

 texture laminated, foliated, and greafy, or of a. 

 foapy feel to the touch ; does not effervefce with 

 acids. Anal. Magnefia 44. Silex 50. Argili 6. 



e. Lapis Ollaris, Pot-ftone, or Indurated talc; 

 of a pale yellowifh and greenifh grey, reddifh grey, 

 or white colour 3 with micaceous particles ; found 



in 



