Opal, the traditional October birthstone, is an amorphous and hydrated form of silica. Technically while grandfathered in, it's not even a mineral at all! Because the water content differs from opal to opal and can even change over time, it does not fit the definition of a mineral. That said, it's one of the most fascinating gemstones on the planet. The fun play of color happens as light passes through the tiny silica spheres that make up the opal. Basically creating a prism effect. How cool!
Mooney Fine Mineral
Opal, the traditional October birthstone, is an amorphous and hydrated form of silica. Technically while grandfathered in, it's not even a mineral at all! Because the water content differs from opal to opal and can even change over time, it does not fit the definition of a mineral. That said, it's one of the most fascinating gemstones on the planet. The fun play of color happens as light passes through the tiny silica spheres that make up the opal. Basically creating a prism effect. How cool!
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