CO 



ANALYSIS OF LAZULITE. 



Mr D'swork 

 a complete 

 view of the 

 properties of 

 Tegeubles. 



Of 76 families 

 analogy little 

 violated in 46, 

 and not at all 

 in 23. 



including not only those that are admitted into our European 

 Pharmacopoeias, but those that arc employed medicinally by 

 the inhabitants of any part of the globe. In this respect Mr. 

 Dccandolle's work gives a complete and methodical display 

 of the properties of vegetables: and the result of this exhibi- 

 tion is, that, of seventy-six families, the properties of which 

 are known, there are thirty-seven where the law of analogy is 

 violated, twenty-three where it is completely preserved, and 

 forty-six in which it is observable with a small number of 

 exceptions. 



VI, 



Analysis of the Siderite, or Lazulite i by Messrs. Tromms- 

 dorff and Bernhardi*. 



Lazulite of 

 Stiria. 



T: 



Analysed by 

 Klaproth, 



and by Heim 



Little analo- 

 gous to feldt- 

 spar. 



Its usual form. 



HE lazulite was found at first near Waldbach, in 

 Stiria, and afterward in the environs of Wienerisch- 

 Neustadt. It is sufficiently known from the works of vari- 

 ous mineralogists. Some time after a mineral was discovered 

 in the country of Salzburg, which was called mollite; but 

 baron Moll has given it the name of siderite, on account of 

 its acknowledged identity with this fossil according to the 

 researches of Mr. Mohs. 



Though Klaproth found in the lazulite of Vorau silex, 

 alumine, and iron, he could not ascertain their proportions, 

 from the smallness of the quantity he had to examine. An 

 analysis of the siderite by Heim gave 0*6'5 alumine, and 

 0*30 iron. 



It is strange, that Messrs. Klaproth, Estner, and Mohs, 

 should fancy there was a great analogy between the lazulite 

 and feldtspar, as analysis shows this analogy to be very 

 slight; and that between their crystallizations and contexture 

 is equally so. 



The most usual form of tbe lazulite is a regular octaedron 

 with truncated edges, passing to the regular rbomboidal 



* Annales de Chimie, Vol. LX1I, p. 43, April, 1807. Abridged from 

 Gehlen's Journal by Mr. Vogel. 



dodecaedron 



