122 



PHYSIOGRAPHY. 



Chabasie. 



Lustre vitreous. Color white or reddish white : rarely 

 yellowish white. Streak white. Semi-transparent . . . 

 translucent. 



Brittle. Hardness =4-0 ... 4-5. Sp. gr.= 2- 100, crys- 

 tals from Bohemia. 



Compound Varieties. Twin-crystals. 



In this figure the face of Fig. 129. 



composition coincides with 

 the vertical axis ; and the 

 angle of revolution = 80. 

 Fig. 127, in place of the pri- 

 mary, sometimes enters into 

 composition in the same way. 

 Massive : composition granu- 

 lar, of various sizes ; faces of 

 composition uneven. 



1. Alone before the blow-pipe, it melts into a white blebby mass. It 

 is not acted on by the acids. 



2. Analysis. 



with soda. 



3. Chabasie chiefly occurs in the cavities of amygdaloidal rocks. It 

 has been found also in seams between the layers of gneiss and mica- 

 slate. It is accompanied by Stilbite, Laumonite, Calcareous Spar and 

 Quartz. 



4. The largest and most distinct crystals are found in Iceland, the Fa- 

 roe islands, and the vicinity of Aussig in Bohemia. Other localities are 

 Altenberg near Oberstein in Saxony, Talisker in the isle of Skye, Glen 

 Fary in Perthshire in the north of Ireland, and near Swan's creek in the 

 Basin of Mines, Nova Scotia. At this last named place it occurs of a 



