OHDER IV. GENEEA AND SPECIES. 407 



1. PRISMATIC. Hemi-prismatic. '.- = 120 23'. Incli- 

 nation = 0. 



Cleavage, (Pr + oo) 3 = 80 9'. Somewhat more dis- 

 tinct, Pr + co. 



Borax. ii. 52. 



X. BRITHYNE-SALT. Prismatic. 



Taste saline, feebly astringent. 

 H. = 2-5 ... 3-0. 

 G. = 2-75 ... 2-85. 



fe 



1. PRISMATIC. Hemi-prismatic. = 120 22'. Incli- 

 nation = 22 49'. 



Cleavage, P . oo, perfect. Traces of P + oo = 80 6'. 

 Inclination of P oo on P + oo = 104 28'. 



Glaulerite. ii. p. 54. 



Bloedite. iii. 79. 



Mascagninc. iii. 125. 



Nitrate of Soda, of Chemists. iii. 132. 



Polyhalite. iii. 141. 



Sulphate of Cobalt. Chem. iii. 145. 



Sulphate of Potash. Chem. iii. 159. 



Trona. iii. 164. 



