Muriatic Genus. 61 



tains | of its weight of magnefia. Mar* 

 graaf> 2- 7 fail. p. 18. 



SPECIES II. 



Combined with Aerial Acid, above four times 

 its 'weight of Silex, and afmalkr fropor- 

 tion of ArgilL 



I. VARIETY. 

 Steatites. 



This is always of a green or greenifh co- 

 lour, and fo foft as to be fcraped by the nail ; 

 of a foft foapy feel : its texture undiftinguifh- 

 able; its fpecific gravity from 2,433 to 2 >7^ 

 It is not eafily diffufible in water, nor ren- 

 dered duftile by mixture with it. 



It does not effervefce with acids, and is 

 very flowly and only partially foluble iu the 

 three mineral acids. 



In fire it hardens, but is infufible per fe^ 

 and becomes whiter. It is imperfedtly melt- 

 ed by mineral alkali and niicrocofmic fait, 

 but more perfe&ly by borax. It is apt to 

 corrode the crucibles; 



According 



