98 PHYSIOGRAPHY. CLASS n. 



4. BRACHYTYPOUS* LIME-HALOIDE. 



Dolomite (in part). JAM. Syst. Vol. II. p. 462. Brachy- 

 typous Limestone or Rhomb-spar. Man. p. 60. Bit- 

 ter-spar (in part). Carbonate of Magnesia and Iron. 

 PHILL. p. 163. 378. Rautenspath (in part). WERN. 

 Hoffin. H. B. III. I. S. 60. Bitterkalk (in part). 

 HAUSM. III. S. 950. Bitterkalk (in part). LEONH. S. 

 579* Chaux carbonate'e magne'sifere (in part). HAU Y. 

 Trait^, T. II. p. 187. Tabl. comp. p. 5. Traite', 2de 

 Ed. T. I. p. 428. 



Fundamental form. Rhombohedron. R = 107 

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



a = V 1-9766. 

 Simple form. R (P), Zillerthal, Salzburg. Com- 



binations unknown. 

 Cleavage. R, highly perfect. Very often con- 



choidal fracture in the direction of R 1. 



Fracture conchoidal. Surface, even, rather 



rough. 

 Lustre vitreous, sometimes inclining to pearly upon 



faces of cleavage. Colour, white or grey, gene- 



rally inclining tp yellow ; also yellow and brown. 



Streak greyish- white. Transparent ... translu- 



cent. 

 Brittle. Hardness = 4-0... 45. 



<z~ r~ (3-001 a clove brown) . 

 Sp. Gr. = {3. mapaleye i low }nety 



Compound Varieties. Massive : composition 

 granular, individuals strongly coherent ; face of 

 composition uneven and rough. 



* From PeK%i>i short, and 



