Seyberfs Analysts of various Minerals. 115 



Klaproth, Herngariar variety is constituted per 100 of Si- 

 lica 50.0, Lime 45.0, and Water 5.0** 



The chief difference of my results, from those of Profes- 

 sor Klaprolh, concerns the water contained in the speci- 

 mens respectively examined. M. Berzelius considers the 

 water in this mineral as accidental^ and observes that some 

 specimens contain no water.t My statements are confirm- 

 ed by an analysis of the Tabular spar, from Parkas, by M. 

 Bonsdorff, of Albo;J his experiments gave the following re- 

 results per 100, viz. — Silica 52.58, Lime 44.45. Magne- 

 sia 0.68, Protoxide of Iron 1.13, Alumina a trace, Vola- 

 tile matter 0.99. 



It is an interesting fact, that this mineral, whether found 

 in Hungary, Sweden, or in the United States, is constantly 

 associated with substances of corresponding characters ; 

 that of Dognazka is united with brown crystallized Garnets 

 and blue calcareous spar: that of Pargas, with black sphene, 

 an amorphous mineral, of a reddish colour, resembling 

 Idocrase or Garnet, and small grains of a green substance, 

 resembling Actynolite (probably Pyroxene :) that of the 

 United States with Colophonite and Pyroxene. 



2. Green Pyroxene. 



u 



Colour emerald green, powder nearly white. Transpa- 

 rent. Lustre, vitreous. Scratches glass. Has a cleavage. 

 Granular, and is found imbedded in Tabular spar, accompa- 

 nied by f 'olophonite, the grains are frequently compressed. 

 Not magnetic- Specific gravity 3.377. Fusible, before 

 the blowpipe, into a dark opaque globule. 



Analysis. 



A. 3 grammes of this mineral, having been selected with 

 great care, were reduced to an impalpable powder, and ex- 

 posed to a red heat; the color of the powder underwent 

 no alteration, there was therefore no absorption of oxygen ; 

 the weight, after the calcination, was 2.^^8 grammes there- 

 fore the moisture amounts to 0.02 grammes on 3 grammes, 

 or 0.666 per 100. 



•BeitroBge, 3. p. 289. 



t Nouveau Syateme Mineral ogique, p. 28. 



% Aonali of Philosophy, Oct. 18-20. p. 300. 



