Cronstedtite

  Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. It has a formula of Fe²⁺₂Fe³⁺(Si,Fe³⁺O₅)(OH)₄.

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It was discovered in 1821 and named in honor of Swedish mineralogist Axel Fredrik Cronstedt (1722-1765). It has been found in Bohemia in the Czech Republic and in Cornwall, England.

References

• American Mineralogical Society
• Mindat with locations
• Webmineral