$400Median
1Sold (12 mo)
$400Last sale
Cronstedtite specimens for sale
8 for sale · $400–$9,500 USD
2 in the gallery
Cronstedtite is an iron silicate hydroxide mineral that forms as dark, metallic to black-green masses or foliate aggregates in hydrothermal veins and alteration zones. It typically exhibits a dull to metallic luster and a platy or tabular habit, often intertwining with other iron-rich minerals in complex textures. Crystals are rarely large, but the mineral can occur in well-formed sheets and lamellar masses that catch and reflect light along sharp edges. Its color ranges from steel-grey to submetallic and occasionally bluish-green in transmitted light, with a composition dominated by iron in mixed oxidation states and sulfate-free silicate structure.
- Formula
- Fe2+2Fe3+(SiO4)(OH)2
Buy Cronstedtite specimens
View all 8Where Cronstedtite is found
Top localities
- Brunita open pit1 specimen
- Wheal Jane1 specimen
About Cronstedtite
Notable localities include regions in the UK, Romania, Hungary, Bolivia, and Spain, where Cronstedtite occurs alongside other iron minerals in hydrothermal veins, carpholite-bearing zones, and later-stage alteration assemblages of iron-rich rocks. Collectors prize it for its distinctive dark appearance, layered habit, and association with accessory minerals such as pyrite, goethite, and other iron silicates, which together form visually striking textures in hand samples and thin sections. While not rare in the right hydrothermal contexts, Cronstedtite is valued for its historical mineralogical significance and its compatibility with European classic locality specimens, offering a window into late-stage alteration processes in iron-rich systems.
