Crystal-fiber gypsum vein, Rincon Mountains, Tucson, Arizona


I collected this from a clay quarry located along the southern margin of the Rincon Mountains.  I like it because it is such a clear ‘inside’ view of crystal fiber veins and how they grow.  Gypsum is a lovely, satiny material, made even better when it grows like fibers in response to structural deformation.

Age & Formation
Host rock is Miocene fanglomerate of the Pantano Formation, ~26 Ma.
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