Labradorite is a feldspar mineral known for its iridescent play of color, called labradorescence, which displays flashes of blue, green, yellow, and orange when viewed from different angles. It is primarily composed of calcium, aluminum, and silicate and is most often gray or black with vibrant spectral colors. Labradorite has a Mohs hardness of 6 to 6.5, making it durable enough for use in jewelry, especially cabochons and pendants. It is found primarily in regions such as Canada (Labrador), Madagascar, and Finland.