PHYSIOGRAPHY. 



Baryto-Calcite. 



51 



Secondary form. 



Fig. 53. 



Cleavage perfect parallel to M and M 7 ; less easily ob- 

 tained, though perfect, parallel to P. 



Fracture uneven, imperfectly conchoidal. 



Surface h striated parallel to the edges of combination 

 with M ; the vertical planes parallel to the axis. 



Lustre vitreous, inclining to resinous. Color white, 

 greyish yellowish, or greenish. Streak white. Transpa- 

 * rent . . . translucent. 



Hardness =4-0. Sp. gr. =3'66. 



Compound varieties. Massive : composition granular. 



1. It does not melt alone before the blow-pipe, but gives a clear glob- 

 ule with borax. Like Witherite, it is soluble in muriatic acid. 



2. Analysis. 

 By CHILDREN. 



Carbonate of barytes . . . 65-9 

 Carbonate of lime . . . 33-6 



It sometimes gives traces of iron and manganese. 

 3. It occurs at Alston moor in Cumberland, both massive and crystal- 

 lized. 



BATRACHITE. 



Massive, with traces of a rhombic prism of 115. Composition 

 impalpable. 



