late Dlfcoverles in Science. 2^9 



Oxyd of manganefe - O'l 

 Lofs - - - 3-25 



We have, however, feen that Dr. Kennedy extraAed from 

 It potafh. 



Vauquelin has obtained polafh alfo from feld-fpar. 



I have d^fcribed in my Theory of the Earth * a ftone of 

 a rofe colour cryftallifed, almoft hexaedral, with a triedral 

 pyramid, which was fold to me as coming from Dauria, 

 and for that reafon I gave it the name of Daurite, It has 

 been examined alfo by Hermina, who calls it Sibcrite. He 

 obferved that it is pyro-ele6lric, like the tourmalin. Garin 

 apd Pecheur analyfed it, and found that it contains : 

 Alumine - - - 48 

 Silex - - - ' 3*^ 



Lime - - - 03*5 



Oxyd of manganefe - 09 



Abilgaard'sj?«a/ of aluvi'me. This is a new ftony fubftance 

 found in Greenland. It is formed of whitifli femi-tranfpa- 

 rent laminte which fabdivide themfelves into right prifms, 

 which, according to Haiiy, appear reflangular. Its fpecific 

 gravity, according to the fame author, is 2,*949. It fufcs 

 by the flame of a taper, and flows like glafs by the blow- 

 pipe : for this reafon it has been called at Copenhagen crya- 

 lUc. It is compofed of alumine and fluoric acid. 



Melarife. Klaproth has given this name to a ftone hi- 

 therto called the black granite of Frefcati. The form of its 

 cryftals is a dodccacdron, with rhomboidal planes truncated 

 on the twenty-four edges, which gives it thirty-fix facets. 

 Vauquelin has analyfed it. 



Sage has publifhed feve'ral memoirs. 



I ft, This chemift has confirmed, that what has been con- 

 fidered as a white volcanic glafs is only a kind of chalcedony. 



2d, He has obtained beautiful cryRals of gold by reducing 

 it by ether. 



3d, He has analyfed the aflies of vareeh, in which, he 

 fays, he found only a little foda ; but an anonymous author 



* This .itticle is t.:'<en from the Journal de Pbvjiquc, of wliich DeU- 

 mrthenc, who here fjHaks, is the editor. — F.oit- 



L 1 :> informs 



