Feldspar crystal | EtsyLooking for the perfect feldspar crystal? You can stop your search and come to Etsy, the marketplace where sellers around the world express their creativity through handmade and vintage goods! With Etsy, buyers like you can find hundreds or thousands of unique, affordable feldspar crystal! Let's get started!feldspar stones for sale,Feldspar Gemstones: Buy Natural Feldspar Gems at GemSelectThe two main subgroups of feldspar is potassium feldspar and plagioclase. The most well-known feldspar gemstones are moonstone, orthoclase, amazonite, andesine, labradorite and sunstone.