Rob Lavinsky, http://www.irocks.com/minerals/specimen/9080

What is a reindeer’s favorite copper sulfate mineral? Antlerite! Antlerite is named after the Antler Mine in Arizona, but was more often found in Chuquicamata Mine in Chile. That mine has been closed, so antlerite is pretty rare now. This is a close-up of a specimen from the Chuquicamata Mine measuring 7.4 x 3.8 x 2.2 cm.

Rob Lavinsky, http://www.irocks.com/minerals/specimen/9080

The whole plate, with fingertips included for scale.