M.J. Hibbard
Gypsum


Gypsum   CaSO42H2O    Monoclinic
o Oxide zone of sulfide deposit. (chapter 13)
- Two crystals of selenite gypsum dominated by the broad side pinacoid [010} and faces of the prism {110}. Crystal in the rear is twinned, presenting fish-tail morphology (upper left). Crystals are 3 cm wide. Robinson Mining District, Nevada. Keck Museum/MSM.

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