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Cobalt spinel is a rare blue variety of the mineral spinel, colored by trace amounts of cobalt. Unlike typical grayish-blue spinels colored by iron, cobalt spinel exhibits a vivid, pure blue hue. Significant deposits are found in Vietnam and Tanzania. It is frequently used in fine jewelry and is fav...
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Cavansite is a striking blue calcium vanadium silicate mineral discovered in 1967, notable for its rarity and occurrences primarily in India and Oregon.
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Azurite is a deep-blue copper carbonate mineral historically ground into a pigment used in Renaissance paintings, and naturally occurring in the copper-rich regions of France and Australia.
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