I was stunned when this turned up in an old collection. My first thought was that this had to be an azurite until I looked closer. The crystal is HUGE for the species, a compound crystal that is fat and thick and nearly 2 cm across. It is pristine and undamaged. I have not cleaned it because I believe the powdery coating is another mineral species, phillipsburgite, and the slight contrast is visually appealing. This is a major, major crystal for the locality and a large thumbnail of impact and significance, good for any top rarities or thumbnail collection.