ORDER v. PRISMATIC EUCHLORE-MICA. 181 



Fundamental form. Scalene four-sided pyramid of 

 unknown dimensions. Vol. I. Fig. 9. 



Simple forms. P cc ; P -f oo ; Pr + CD. 



Char, of Comb. Prismatic. 



Combinations. 1. P oo. P+ cc. Schwatz, Tyrol. 

 2. P QD. P -f- QD. p r + co. Schwatz. 



Cleavage, P QD perfect. Fracture not observ- 

 able. Surface, P -f- ce deeply streaked in a 

 horizontal direction. The rest of the faces 

 smooth. 



Lustre pearly upon P ce, both as faces of crys- 

 tallisation and of cleavage ; vitreous upon the 

 , other faces. Colour pale apple-green and verdi- 

 gris-green, inclining to sky-blue. Streak of the 

 same colour, only paler. Translucent, general- 

 ly only on the edges. 



Very sectile. Thin laminae are flexible. Hard- 

 ness = 1-0.. .1-5. Sp. Gr. = 3-098 of a crys- 

 tallised variety from Schwatz. 



Compound Varieties. Reniform and botryoidal 

 shapes : surface drusy, composition columnar, faces 

 of composition a little rough. 



OBSERVATIONS. 



1. According to Mr BROOKE, the present species con- 

 sists of hydrate of zinc and copper. 



2. It occurs in beds and veins, accompanied by other ores 

 of copper, particularly prismatic Azure-malachite, also by 

 prismatic Zinc-bary te, rhombohedral Quartz, rhombohedral 

 Lime-haloide, and octahedral Fluor-haloide. 



3. The known localities of this species are the Bannat of 



