Mica Pegmatite - Harding Mine New Mexico Mica pegmatite is a very coarse-grained igneous rock rich in mica (often muscovite or biotite), quartz, and feldspar, formed from a water-rich, granitic melt that cools slowly beneath the Earth's surface. These deposits can be commercially valuable for mica, rare elements like lithium, beryllium, and niobium, and gem minerals, due to their large crystal size and mineralogical richness. They often display a zonal structure with different minerals concentrated in distinct zones within the mas ** WE HAVE MANY BEAUTIFUL MINERAL SPECIMENS FROM THE USA AROUND THE GLOBE ** MOST ARE FROM OUR VARIOUS TRIPS ** ** SEE ENTIRE STORE FOR AMAZING MINERALS ** ** OUR GOAL IS TO MAKE COLLECTING FUN AFFORDABLE FOR ALL WITH GREAT LOW PRICING * #394