186 PHYSIOGRAPHY. CLASS II. 



the colour, though a little paler. If the mineral 

 be crushed into powder in a dry state, this powder 

 possesses a deep lavender-blue tinge, which is 

 not the case if the powder be comminuted in wa- 

 ter. Transparent... translucent on the edges. 

 Crystals are least transparent in a direction per- 

 pendicular to Pr -f- oo. 

 Sectile ; thin lamina? are flexible parallel to the in- 



4 jS r Q 



tersection of Pr -f GO with I Hard- 



2 



ness = 1-5 ... 2-0, the lowest degrees upon 

 Pr + QD. Sp. Gr. = 2-948, a red crystallised 

 variety from Schneeberg.* 



Compound Varieties. Implanted globular and 

 reniform shapes ; surface drusy ; composition more 

 or less perfectly columnar, of various sizes of in- 

 dividuals, faces of composition either smooth or 

 rough. Massive, composition columnar, often 

 stellularly divergent, and aggregated in a second 

 granular composition, faces of composition rough. 

 Sometimes in a state of powder as a coating upon 

 other minerals. 



OBSERVATIONS. 



1. The species Red Cobalt is generally divided into 

 two sub-species, Colalt-Bloom and Cobalt-Crust. The for- 



* The Privy Counsellor, Baron VON HERDER, kindly com- 

 municated to me several beautiful varieties of the species, to 

 which the preceding general description more particularly 

 refers. M. 



