This opal species, also called sea opal or opaline, is found in the water. It is characterized by its light blue, transparent color, sometimes with a milky tint. This color is caused by the structure of the stone, where light is reflected by small spheres, causing a blue tint. Properties of blue opal: Color: Blue opal can range from light blue to a deeper night blue color. Optical properties: The blue color is a result of the structure of the stone, where light is reflected by small, interconnected spheres. Hardness: Blue opal has a hardness of 5.5 to 6.5 on the Mohs scale. In spiritual circles, it is associated with the throat chakra, which has to do with self-expression, something often found in sailor stories and songs.
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