$80Median
1Sold (12 mo)
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Thaumasite specimens for sale
2 for sale · $750–$5,000 USD
6 in the gallery
Thaumasite is a sulfate silicate mineral that forms as colorless to white, often pale-tinted crystals in hydrothermal or alteration environments. It commonly occurs as tabular or slender prismatic habit with a vitreous to silky lustre, and can fill cavities or develop within carbonate-sulfate bearing rocks. Its distinctive composition includes calcium, sulfate, silicate, carbonate, and water, which can lead to complex, sometimes lamellar intergrowths with other minerals in altered environments.
- Formula
- Ca3(SO4)[Si(OH)6](CO3) · 12H2O
- Classification notes
- Complex hydrated calcium sulfate-silicate-carbonate mineral (Sulfates with silicate and carbonate components)
Buy Thaumasite specimens
View all 2Where Thaumasite is found
Top localities
- N'Chwaning II Mine2 specimens
- Bellerberg volcano1 specimen
- N'Chwaning Mines1 specimen
- Paterson1 specimen
About Thaumasite
Notable specimens have been reported from a range of localities, including South Africa, the United States, and Germany, where it can crystallize in vein fillings or as part of alteration assemblages associated with calcium-rich rocks. Collectors value Thaumasite for its delicate crystal forms and the sometimes pristine, colorless to faintly tinted crystals that contrast with host rock matrix, as well as its rarity in certain deposits. Reflecting its hygroscopic and water-rich nature, the mineral can be sensitive to air exposure, making careful handling and storage important for maintaining specimen quality.
