Analysis of sRONZiTfi. 



pitate obtained, after being strongly heated, consisted of 

 Magnesia. 27'5 grains of pure ma<^nesia. 



C. Sixty grains of bronzite were heated red hot with 

 300 grains of nitrate of barytes, till the nitrate was com- 

 pletely decomposed. The mass, being triturated, diluted 

 with water, and supersaturated with sulphuric acid, was 

 boiled for some time, and then filtered. The free sulphuric 

 acid having been saturated in great part with ammonia, ace- 

 tate of barytes was added. The supernatant liquid was 

 poured off, and evaporated to dryness. The residuum was 

 heated red hot, then elutriated with hot water, and the li- 

 quid filtered oft". This liquid contained a trace of potash, 

 for reddened litmus paper acquired a blue tinge from it after 

 some time; but one drop of nitric acid was more than suf- 

 ficient to destroy this alkalinity, and give the liquid an acid 

 character. 

 Component Bronzite therefore is composed of 



P*^^^- Silex - - 60 



Magnesia - 27*5 



Oxide of iron - 10'5 



Water - - 0-5 



Occurs dissemi 

 nated in ser- 

 pentine. 



Hatty's dial- 

 ]age, 



98-5 



The bronzite here described is the only instance known 

 of its being found in compact masses; though it is fre- 

 quently found in little separate pieces in serpentine; for in- 

 stance, near Teinach, in the Pacher-Alp, in Lower Stiria. 

 at Mount Hradicko in Moravia, at Zellerwalde near Sie- 

 benlehn, near Guanabacoa in Cuba, &c. 



It is not yet decided whether the schillerstein (schillcr- 

 spath, schillerblende) in the serpentine of Baste, near Hartz- 

 bourg, in the Hartz, may also be classed with it. As the 

 analyses of this mineral yield alumine to the amount of 0*23 

 according to Heyer, and of O'lS according to Gmelin, it 

 should be classed with the schillernden hornblende, as has 

 already been done by Mr. Karsten, if this large proportion 

 of alumine be confirmed. 



Mr. Haliy has made a separate species under the name of 

 diallage, in which he has classed the smaragdite as green la- 



mello-fibrons diallage, 



and the bronzite lie gives as a variety 



of 



