Labradorite is a feldspar mineral known for its striking iridescent play of colors, called labradorescence, which displays shimmering hues of blue, green, gold, and sometimes purple. It has a hardness of 6-6.5 on the Mohs scale, making it durable enough for jewelry but requiring care due to its cleavage. Its base color is typically a dark gray or black, which contrasts beautifully with its vibrant flashes of color.