Thaumasite

Unknown Owner

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A superb 4.0 x 3.1 x 2.5 cm specimen of ettringite with multiple gem crystals, on matrix, from the classic find in the 1980s. The largest gem crystal is 1.0 x 0.8 x 1.0 cm and is a beautiful pale yellow with sharp hexagonal terminations. For both the composition and size, this is a must have of this rare ettringite-group mineral. You almost never see any bigger than a thumbnail!