TAB. XXV. 



CUPRUM nativum ; var. arboreseens. 

 Native Copper ; var. arborescent. 



Class 3 . Metals. Ord. 1 . Homogeneous. 

 Gen. 7. Copper. Spec. 1. Native Copper. 



Div. 1. Crystallized. 

 Syn. Kirw. v.2. 128. Hatty, v. '3. 521, 



Arborescent copper differs from the dendritical, (which 

 branches chiefly from its sides, and is mostly compressed,) 

 in branching many ways without compression, and in gene- 

 ral being more perfect in crystallization, as it is formed 

 among loose fragments of quartz. The crystals are 12-sided, 

 and sometimes large enough to be easily seen without a 

 lens ; at others many are accumulated and attached to each 

 other in different directions, forming the appearance of a 

 rough stem and leaves. They often widen and form macles. 

 The colour and lustre vary from light and bright yellowish- 

 red to bright brown-red. The lower figure I bought in 

 Truro, and understood that it came from a mine in that 

 Vicinity. The upper figure is rather between dendritical and 

 arborescent copper, but the definition is of no real conse- 



