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6.5 " tall Blue onyx is a striking, translucent variety of chalcedony and marble (microcrystalline quartz) featuring rich layers of sky to deep oceanic blue, often interwoven with white, cream, orange, and brown veins Scientific Name: Cryptocrystalline quartz (often banded) or travertine calcite. Metaphysical Practice: Often used as a meditation tool, many believe the stone encourages emotional balance, self-expression, and mental focus