214 PHYSIOGRAPHY. 



Strontianite. 



of composition. This composition is very similar to some 

 that occur in Arragonite. The product of it is a six-sided 

 prism, having four edges of 117 19' and two of 128 22'. 

 As in that species, particles of the two individuals alter- 

 nate in parallel layers with each other. Indistinct globular 

 masses. Surface drusy, composition columnar. Mass- 

 ive : composition columnar, the individuals generally 

 straight, long and a little divergent; the composition is sel- 

 dom granular. 



1. It melts before the blow-pipe at a temperature not very elevated, 

 but only on the thinnest edges. It intumesces -and spreads a brilliant 

 light, the flame at the same time assumes a reddish hue. It is dissolved 

 by borax with a violent effervescence into a clear globule. It is solu- 

 ble with effervescence in muriatic and nitric acids : and paper dipped 

 into this solution and afterwards dried, will burn with a red flame. 

 2. Analysis. 



By KLAPROTH. 



Strontita 69-50 



Carbonic acid 30-00 



Water . 00-50 



3. The repositories of this species, are metallic veins traversing prim- 

 itive and transition mountains. It seems also to occur in beds. 



4. It was first discovered at Strontian in Argyleshire in Scotland, and 

 found afterwards at Braunsdorf in Saxony in large crystals, at Leogang in 

 Salzburg, and also in Peru. It has of late been found, in abundance at 

 Schoharie, (N. Y.) disseminated in geodes and nests through water- 

 limerock ; also in large veins or beds. In one of these last, it exists in a 

 mass of such extent and purity as to have attracted attention as a marble 

 quarry. 



SULPHATE OF ALUMINE. (See Solfatarite.) 



SULPHATE OF AMMONIA. (See Mascagnine.) 



SULPHATE OF BARYTES. (See Heavy Spar.) 



SULPHATE OE COBALT. (See Cob alt- Vitriol.) 



SULPHATE OF COPPER. (See Blue-Vitriol.) 



SULPHATE OF IRON. (See Copperas, Pittizite White 



Copperas and Yellow Copperas.) 



