Purple Anhydrite of Madagascar (4.1kg)
PUMI1410-1
This purple Anhydrite from Madagascar did not formed directly, but is the result of the loss of water in a rock formingl Gypsum. This loss of water produces a reduction in volume of the rock layer and can cause the formation of caverns as the rock shrinks. Anhydrite is an anhydrous calcium sulphate and a member of the Sulfate Class of minerals.Some have blue tone but more often a clear silverish color. This one shows a nice mauve color with some silver hue due to the long bladed crytals that form it. But don't soak it: this lovely anhydrite could turn back to Gypsum!
