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Sillimanite is a rare natural gemstone. The color of Sillimanite can be white, yellowish, gray, greenish, brownish, bluish, violet-blue or colorless. Sillimanite has a hardness 6.5 to 7.5 on the Mohs scale. Sillimanite is a rare collectors gemstone.
The Sillimanite gemstones for sale in this category are natural gemstones!