Subsulphuret of Copper, or Vitreous Copper Ore

This is one of the richest Copper Ores, and is very abundant in Cornwall. Its crystals usually partake of the hexaëdral prism. Thus we have very short truncated hexaëdral pyramids placed upon very short six-sided columns, with many varieties on the same specimen.

The present specimen at one end has these crystals mackled, which I suspect has not been mentioned before: see the right hand figure, which consists of two crystals like the middle one joined together. Some of the crystals on the specimen approach the cross, like the left hand figure. I have a good specimen, with many nearly such, but did not think it necessary to give the whole. The one here figured came from Cooks-Kitchen, Cornwall.