24 MINERALOGICAl 
COPPER-ORES. 
Cornwall is not only poffefied of rich 
tin-mines, but alfo of very rich copper- 
mines, which produce copper ores of va¬ 
rious forms, fpecies and varieties. 
Native copper is found in very confi- 
derable quantity at Cape Lizard, between 
the rocks near the fea-fhore in filiform 
branches, and veins of fome thicknefs, 
contained in blackifli ferpentine, mixed 
with brownifh red, and covered exter¬ 
nally with a greenifh nephrites, partly 
adherent to it, partly loofe upon it. In 
the fame rocks alfo native copper in large 
lumps has been found. 
Huel Virgin produces in a confiderable 
quantity native copper, which fhoots into 
branches of various directions, which 
feem to be formed of finall rhomboidal 
cryftals, interfperfed with quart? cryftals, 
of which often only the impreffions are 
to be feen in the native copper of the two 
fpecimens I have from this place; one 
wtighf 
1 
