TAB. XCIII. 



CUPRUM arseniatum. 

 Arseniate of Copper. 



Class 3. Metals. Order!. Homogeneous. 

 Gen. g. Copper. Spec. 8. Arseniate. 



Syn. Bournon. PA/7. Trans, for 1802. 



This beautiful specimen of Arseniate of Copper was lent 

 me by my good friend Philip Rashleigh^ Esq. of Menabilly. 

 It comes from near Gwenap. The crystals are spoken of 

 by Count de Bournon as his third variety, u perfectly 

 regular for a part of their length, and fibrous at their extre- 

 mity." The present specimen has these crystals with ap- 

 parently four sides of the octaedron, lengthened into fila- 

 ments, and divaricating a little from a centre, forming al- 

 together a sort of brush, narrow at the base, widening 

 towards the apex, and terminating a little abruptly in a 

 sharp or angular point. They are of a dark dull green, 

 somewhat transparent, the ends being generally more opaque 

 and lighter, owing to their fibrous nature : some crystals 



