Eventually, the broth solidified, becoming ore layered with interlocking veins of quartz, chalcopyrite, and other minerals.

This defective chalcopyrite layer leads to more pronounced rollover and crossover signatures in J–V curves.

There it forms a large deposit, in a granitic vein running through gneiss, and is accompanied by quartz, siderite, galena, blende, chalcopyrite, &c.