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A striking 639 carat rossmanite tourmaline from the renowned Tanco Mine in Manitoba, Canada. This impressive crystal is fully terminated and well-preserved, displaying sharp crystal faces that highlight its natural growth habit.

The specimen features a distinctive lithium-rich surface coating, adding visual character and mineralogical importance. Rossmanite, a rare lithium-aluminum tourmaline species, is seldom encountered in large, well-formed crystals, making this piece a notable example of both size and rarity.

At over half a kilogram, this specimen is ideal as a showpiece for advanced collectors, museum collections, or institutional study, combining robust size with mineralogical significance from one of the world’s most important rare-element pegmatite localities.