Remarks

Selenite is the clear transparent form of gypsum.  Like celestite, selenite is a sulfate mineral (calcium sulfate, CaSO4∙2H2O)

For more information go to the Mineralogy Database Website → Selenite Page

• Most of the selenite that we've found occur as small, shale laden crystals.  However, we have a few relatively large pieces.  One of these is the impure piece shown below.

• Strat:  Eagle Ford Group, Arcadia Park Formation; Locale:  Dallas County, Texas; Collector:  Keith Minor.