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A major source of boron, colemanite was discovered in 1884 and named for the California mine owner where it was first found, William Tell Coleman. The color of this stone ranges from colorless to white to grey, sometimes yellowish. Specimens are very sensitive to heat. The short, prismatic crystals are often sought after by collectors and colemanite is rarely seen in the form of gemstones as it presents a challenge to lapidaries as crystals are soft, brittle and have perfect cleavage.
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