This is an eye catching, multiple layered "sandwich" selenite specimen collected from the Lubin Mine in Poland. The selenite displays a coloration that ranges between red, orange and colorless, dependent on conditions and composition of minerals present during formation. 


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.