This Specimen has been sold.
4.5" Selenite Crystal - Kansas
This is a beautiful selenite crystal that was collected from the Cretaceous age Dakota Formation of Kansas.
Selenite is a variety of gypsum, a soft sulfate mineral that is composed of calcium sulfate dihydrate (CaSO4 · H2O). When chemically pure, gypsum is transparent and colorless, however, impurities give the gypsum a diverse range of colors and formations. Desert rose, selenite and satin spar are just a few of the varieties of gypsum known to have formed though hydrothermal processes.
Gypsum var. Selenite