Thaumasite
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Thaumasite
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About Thaumasite
Thaumasite is a rare calcium silicate sulfate carbonate mineral that forms colorless to white acicular or prismatic hexagonal crystals in low-temperature hydrothermal veins and as a weathering product in building materials, particularly concrete affected by sulfate attack. It occurs in classic localities such as Långban, Sweden and in oxidized iron ore deposits in the Alps. Specimens are primarily of scientific interest, prized by collectors for delicate crystal habit.