The latter describes a break along a rough, jagged surface; an example of this property is found in native copper.

Chalcopyrite is rarely found in association with native copper.

It was probably what is called native copper, which is sometimes found in large lumps on the ground.

Arizona used native copper from 1932 to 1934.

In fact, native copper is no longer as easy to find in that state these days.

Stage C: In the first two steps, the mineral used was native copper that does not actually need specialized technology.

Probably, due to the situation that native copper was increasingly difficult to find, copper ore is used in this third step.

The main ore exploited in those times was native copper from the oxidation zone of the deposit.

The miners sometimes found masses of native copper up to hundreds of tons.

The ore also contained native copper, usually as individual grains but often as sheets several feet long.