TAB. XXXVII. 



CUPRUM arseniatum; 

 Arseniate of Copper. 



Class 3. Metals. Order 1. Homogeneous. 

 Gen. 4. Copper. Spec. Q. Arseniate of Copper. 



Div. 1. Crystallized. 



Far. Crystal an hexaedral plate with inclined edges, 



Syn. Cuivre arseniate lamelliforme. Ha'uy, v. 3. 

 p. 578. 

 Arseniate of copper in hexaedral laminae, with in- 

 clined sides. Phil. Trans. 1801,/?. 176, 



1 his beautiful variety is described by Count Bournon in 

 the Philosophical Transactions for 1801, and we cannot do 

 better than profit by his description. u It is in very thin 

 hexaedral laminae, the six sides alternating in an inclined 

 position, with the broad hexaedral planes on either side at 

 an angle of about 135°, and the third at 115°, on the op- 

 posite side." See fig. 1. The crystals are more or less piled 

 on each other, and are often to be divided, or split parallel 

 to their surfaces, in the same manner a? Mica. They are 

 very brittle, mostly of an emerald green, and as transparent 

 as the best glass, their lustre resembling the thin glass called 



