It generally contains ſome alloy of iron.
CUPRUM (copper), mineralized by ſulphur, and a ſmall proportion of iron.
Cronstedt Min. § 198, b. Minera cupri lazurea.
By a ſmall proportion of iron, I mean leſs than the weight of the copper; by a large proportion, more. This contains from 40 to 50 per cent. of copper.
CUPRUM (copper), mineralized by ſulphur, and a large proportion of iron. Pyritical.
Cronstedt Min. § 198. Pyrites Cupri.
The quantity of copper varies greatly, but ſeldom exceeds ⁴⁰⁄₁₀₀.