An aragonite crystal from Morocco.  These didn't quite work out for my optics purposes, but they work great as specimens! The first photo shows the specimen with backlighting from a flashlight.  The last three photos are under ambient lighting conditions.

These are leftover mineral specimens from attempts to produce educational mineral kits for Snellius Minerals LLC. Check out my eBay store to explore some of the educational kits.  We aim to provide the nerdiest mineral samples possible!  Combined shipping available for many items.