159 
TAB. CCLXXIX. 
CUPRU M_hyperoxygenizatum. 
Peroxide or rather Hydrate of Copper. 
$$ 
Tue specimen here figured was brought from Dalehead- 
mine, in Cumberland, and is in the possession of W. E. Shef- 
field, Esq., who, with the utmost generosity, has offered to 
lend his best specimens for this public use. I have only 
seen one exactly corresponding with this as to its waxy ap- 
pearance. In the drops, and general form, they well agree, 
as they do also in fracture; so that it might be called a 
specific distinction. JI was favoured with this latter by 
Mr. Duncan of Penzance, and I have a very neat specimen, 
somewhat approaching it, from Scotland, for which I am 
obliged to my kind friend Gilbert Laing, Esq. 
This variety is certainly rare, especially in fine specimens, 
and may be considered as one of the harder varieties of 
Malachite. The interior of the mamillz is formed of com- 
pact radiated Carbonate of Copper of a darker colour. 
At Dalehead-mine is also found the elegant satiny full 
green radiated Carbonate, so much prized, and chiefly 
known as of Siberian origin. I have indeed small speci- 
mens of it from North Wales ; but hope ere long to figure 
a satisfactory one from Dalehead. 
The gangue of this and the following specimen is a va- 
riegated Pyrites or Sulphuret of Copper with Quartz. 
