8.8" Orange Selenite Crystal Cluster (Fluorescent) - Peru
These crystals only form in conditions where mineral rich water containing selenite forming minerals (calcium & sulfur), evaporates. Every crystal is unique, just like a snowflake.
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.