This is a very nice Selenite crystal slab mineral specimen from Mexico. It is water clear to opaque.

It measures approx 1.5 in thick by 3.75 in wide by 6 in long.

Selenite is part of the Gypsum (hydrous calcium sulfate) family of minerals. It rates a 1 1/2 - 2 on the Hardness scale.

Caution: You may clean the specimen with water, but do not leave it submerged. It will degrade. {sku 975}