106 PHYSIOGRAPHY. CLASS II. 



2. MACROTYPOUS PARACHROSE-BARYTE. 



llhomboidal Red Manganese. JAM. Syst. Vol. II. p. 

 445. Man. p. 63. Carbonate of Manganese. PHILL. 

 p. 246. Rother Braunstein. Braunspath (zum Theil). 

 WEIIN. Hoffm. H. B. IV. S. 158. Rhodochrosit. 

 HAUSM. III. S. 1081. Kohlerisaures Mangan. LEONH. 

 S. 381. Manganese oxide rose silicifere amorphe. 

 HAUY. Traite', T. IV. p. 248. Manganese oxide' 

 carbonate. Tabl. comp. p. 111. Manganese carbonate, 

 i Traite', 2de Ed. T. IV.. p. 272. 



Fundamental form. Rhombohedron. R = 106 

 51'. Vol. I. Fig. 7. R. G. 



a = V 2-0229. 



Simple forms. R 1 (g) = 136 25'; R (P), 

 Kapnik, Transylvania. 



Char, of Comb. Rhombohedral. 



Combinations. 1. R 1. R. Freiberg, Saxony. 



Cleavage, R. Faint traces parallel to R 1. 

 Fracture uneven, imperfect conchoidal. Surface ; 

 R 1 deeply streaked parallel to the edges of 

 combination with R. This produces lenticular 

 crystals. R sometimes smooth, but more gene- 

 rally curved, so as to give rise to saddle-shaped 

 lenses. Vol. I. Fig. 79. 



Lustre vitreous inclining to pearly. Colour, va- 

 rious shades of rose-red, partly inclining to 

 brown. Streak white. Translucent, in different 

 degrees. 



Brittle. Hardness = 3-5. Sp. Gr. = 3-592, the 

 crystallised variety from Kapnik. 



Compound Varieties. Globular and botryoidal 

 shapes : surface sometimes smooth, at other times 

 rough ; composition columnar, often indistinct. 



