Sewardite : CaFe3+2(AsO4)2(OH)2

Copyright © Werner Mühlbauer
minID: CXR-E7K

Sewardite : CaFe3+2(AsO4)2(OH)2

Copyright © Werner Mühlbauer  - This image is copyrighted. Unauthorized reproduction prohibited.

Rosette-shaped sewardite aggregate (PXRD- and EDS-analysed). SEM micrograph.

Deep-red rounded to rosette-shaped sewardite aggregates (PXRD- and EDS-analysed), with a diameter of about 0.1 mm. The sewardite is associated with fine-grained, yellowish beudantite/segnitite (slightly K- and Cu-bearing).
The sample was originally in the collection of the Smithsonian ("arsenobismite"; catalogue # 104010) and kindly provided on loan by curator Dr. Jeffrey Post.

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Photo added: 16th Feb 2011

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