Moonstones come in two varieties: plagioclase feldspar (which contains calcium or sodium)and orthoclase feldspar (which contains potassium). What gives moonstone its eerie, moon-like glow is the crystal formation within the stone.Light catches the very tiny prisms of the crystalline structures, then reflects the colors of the minerals within. The light produced is not the flashing, bright brilliance of faceted jewelry, but it is a softer, glowing brilliance, called adularescence. The item "VINTAGE ESTATE STERLING SILVER MOONSTONE PENDANT NECKLACE MADE IN INDIA GEMSTONE" is in sale since Thursday, March 18, 2021. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Necklaces & Pendants\Gemstone". The seller is "4744366" and is located in Andover, Massachusetts. This item can be shipped worldwide.