Labradorite is a feldspar mineral that is found in various colors like grey, blue, green, and yellow. It is a popular gemstone that has a distinctive iridescence or "labradorescence" that reflects different colors when viewed from different angles. Labradorite is also known as spectrolite, moonstone, Larvikite, black moonstone, and rainbow moonstone. Spectrolite is a type of labradorite that has a richer iridescence, while moonstone is a variety of feldspar that exhibits a similar bluish sheen. Larvikite, on the other hand, is a dark blue-grey type of labradorite that is often used for building and interior design. Black moonstone and rainbow moonstone are also types of labradorite that have different colors and patterns.