Natural Blue Fire labradorite Smooth Hand Polished Pear Drop Briolette Beads Strand Rondelles Sold per 6 beads & Sizes from 10.5mm to 11mm approx.Labradorite a feldspar mineral, is an intermediate to calcic member of the plagioclase series. Labradorescence is a side-effect of the molecular change which occurs in large crystal masses of anorthosite, producing an iridescent play of colors.