This is 500 grams Natural Raw Labradorite slices with peacock flashy colors. The labradorite pieces are in free and loose shapes. Stone: Natural Raw Labradorite Sizes: 15mm to 60mm Colors: Bluish black with peacock feather like flash Treatment: No Origin: Madagascar Labradorite is a feldespar mineral which is popular for its iridescent play of colors. This is called labradorescence. Labradorite is formed in igneous rocks. The rocks are normally basalt and gabbro. The iridescence phenomena occurs from the interference of light which interacts with microscopic layers. The layers are found in the structure of mineral. The phenomena exists due to the lamellar twinning. This multiplies crystal layers reflect and refract light. It creates the shimmering effect. labradorite is found in volcanic activity. This is very popular among jewelry designers.