138 



The specimen figured was sent me by my friend Mr. Sims 

 of Norwich. It has 6-sided prisms, terminated atone end with 

 three faces, resembling those of carbonate of lime, with the 

 obtuse oequiaxe termination. We have a specimen with six- 

 sided bars quite relieved crossing an hollow : three faces of 

 the prism are generally broader than the other three, showing 

 faint longitudinal strias and fractures parallel to them; but 

 most readily to the three broader faces with transverse striae, 

 which continue to the apex of the pyramid, and occasionally 

 form an equilateral triangle. The pyramid maybe divided 

 in a direction contrary to its faces ; therefore the nucleus is 

 adodecaedron with rhomboidal faces. 



They vary in colour from a brightish watery green to a 

 palish brown. It differs from carbonate of barytes (with 

 which it was once confounded), by its weight, as well 

 as by dissolving quickly, and with great effervescence, 

 in nitric acid, without leaving a precipitate : and it is cu- 

 rious that a bit of paper or a wick of a candle, dipped in 

 this solution, after being dried, causes the flame to burn 

 beautifully red ; or the substance itself in fusion by the blow- 

 pipe will do the same thing. Spec. Grav. from 3.4 — 3.675. 

 Hardness 5, according to Kirivan. Scratches carbonate of 

 lime, and is scratched by fluate of lime. 

 Analysis by Pelletier : 



Strontia - - 62. 



Carbonic acid - 30. 



Water - - 8. 



100. 



It is accompanied by carbonate of lime, sulphuret of ba- 

 rytes, sulphuret of lead, and harmotome of Haiiy, or stau- 

 rolite of Kirwan. 



