This item is a chunk of raw labradorite stone that has been polished on one side. It weighs 3 pound 1.2 ounces or 1.394 kilograms with dimensions of approximately 7.1" long, 2.5" wide, and 4.5" tall (see photo with ruler).
Labradorite is a popular decorative stone because of its labradorescence, which creates a dazzling optical phenomenon of a blue green to deep blue sheen that shimmers in the light. Other varieties, including rare specimens, offer a stunning rainbow of green, violet, or orange shimmer called spectrolite.