This Specimen has been sold.
2.4" Ram's Horn Selenite Formation - Mexico
This is a natural gypsum var. selenite (ram's horn) formation that was collected from Mexico. Comes with an acrylic display stand.
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.