ORDER II. BRACHYTYPOUS PARACHROSE-BARYTE. 101 



contained in parallel layers, and forming the striae 

 of the rhombohedron R, obtained by cleavage, in 

 the direction of the horizontal diagonals. Fig. 131. 

 Massive: composition granular, individuals in most 

 cases easily discernible ; often mixed with rhombo- 

 hedral Lime-haloide.- Faces of composition uneven 

 and rough. 



OBSERVATIONS. 



1. The chemical constituents of this species are as yet 

 unknown, at least as to their relative quantities. It con- 

 tains, besides carbonate of lime, also carbonate of iron. 

 It becomes black before the blowpipe, and acts upon the 

 magnetic needle. In nitric acid it is soluble with a brisk 

 effervescence. The colour is darkened on the surface, by 

 being exposed to the air. 



2. This species occurs in the Rathhausberg in Salzburg, 

 upon beds in mica-slate, in many places upon the beds of 

 brachytypous Parachrose-baryte, extending from Stiria all 

 along the chain of the Alps, as in the Golrath, and at 

 Eisenerz in Stiria, in Salzburg, &c. The compound Stirian 

 varieties from the Raiding mountain near Vordernberg, 

 and the Rothsol on the Veitschalpe, belong to a more re- 

 cent class of rocks. 



3. It forms an excellent addition in the process of melting 

 iron-ores. 



OBDER II. BARYTE. 

 GENUS I. PARACHROSE*-BARYTE. 

 1. BRACHYTYPOUS PARACHROSE-BARYTE. 

 Sparry Iron. JAM. Syst. VoL II. p. 451. Rhomboidal 



* From v&itixtufft;*) change of colour. 



