These crystals are very sharp for English bornite, and reach in size to 2.0 cm across. They are perched on a translucent shard of crystallized, colorless quartz crystals to 1.0 cm are several crystals of metallic gray, lustrous, pseudocubic crystals of bornite. The isolation of the bornite is highly unusual and aesthetic. While the specific mine name has been lost to history, this specimen is from the collection of Dr. Eric Asselborn, owner of one of Europe's finest collections. This came from a trade with the BMNH and that he had been told "Carn brea" at the time (as a general area, rather than the specific mine).