13 x 10 mm. 6.4 cts. Florida named moonstone as its gemstone to highlight its participation in manned missions to the Moon. Moonstone deposits are not actually found in Florida. Traditional "Moonstone" consists of albite, alternating with layers of either orthoclase or sanidine. The layering interferes with the light entering the stone, resulting in a shifting blue glow known as adularescence (after the gem's original name: "adularia"). This example is from Sri Lanka.