PYRALLOLITE. 



POLYHALITE. 

 SALT. 



Polyhalit. STROMEYER. Untersuchungen. VoL I. p. 144. 

 Poly halite. PHILL. p. 199. 



Massive : composition columnar. Fracture splin- 

 tery, uneven. 



Lustre resinous. Colour smoke-grey and pearl- 

 grey, flesh-red and brick-red. 



Hardness greater than 3-0. Sp. Gr. = 2-7689, 

 STROMEYER. 



Taste saline and bitter. 



In the flaine of a candle it melts into an opake globule, is 

 readily dissolved in water, and, according to STROMEYER, 

 consists of 



Sulphate of Potash 277037. 



Anhydrous Sulphate of Lime 44-7429. 



Anhydrous Sulphate of Magnesia 20-0347. 



Muriate of Soda 0-1910. 



Water 5-9535. 



Peroxide of Iron 0-3376. 



It occurs at Berchtesgaden and Ischel, along with hexa- 

 hedral Rock-salt, and the two species of Gypsum-haloide. 

 It has lately been discovered also in the salt mines of Vic 

 in Lorraine. 



PYEALLOLITE. 



Pyrallolith. NORDENSKIOLD. Schweiggers Journal fur 

 Chemie and Physik. XXXI. 387- Pyrallolite. PHILL. 

 p. 68. 



Tetarto-prismatic. Comb. I. M. T. Sim. Fig. 81. 

 Inclination of M on T = 94 36' ; of I on M = 

 140 49*. 



