labradorescencea

Labradorescencea is a term used to describe a vibrant, iridescent play of color that is characteristic of labradorite gemstones. This phenomenon is not caused by the inherent color of the mineral itself, but rather by the way light interacts with microscopic inclusions within the crystal structure. These inclusions, often lamellar layers of different feldspar compositions, cause light to diffract. As the angle of illumination or the viewing perspective changes, different wavelengths of light are reflected, creating the dazzling spectral display.

The colors typically seen in labradorescence range from blues and greens to yellows, oranges, and even purples and reds. The intensity and breadth of the color spectrum are key factors in determining the value of a labradorite specimen. While the base color of labradorite is usually dark gray, black, or greenish-gray, the labradorescence is the primary feature that makes it highly prized for jewelry and ornamental purposes. This optical effect is a form of adularescence, a shimmering iridescence seen in other minerals, but specifically named labradorescence when referring to labradorite. The precise arrangement and size of the internal layers are crucial for producing the most desirable and pronounced color flashes.