Hexahydrite, Epsomite
Arcilla cave, Calatayud, Zaragoza, Aragon, Spain
Epsomite transforming to hexahydrite. Hexahydrite has a milky white color and matte aspect. The translucent silky shine of epsomite is not in the hexahydrite.
Epsomite is unstable in mineral collections, even into the caves. When passing the days and epochs of dryness, it quickly becomes hexahydrite.
Picture taken in "La Arcilla" cave, October ...
© F. Gascón Cuello