A brownish mineral deposit consisting of a mixture of silicates, formed by alteration of olivine.
- Iddingsite is a mixture of orthopyroxene, maghemite, hematite, cristobalite, and amorphous silica that is formed from olivine.
- The Lafayette meteorite contains abundant iddingsite, a fine-grained intergrowth of smectite clay, ferrihydrite, and ionic salt minerals.
Late 19th century: from the name of Joseph P. Iddings (1857–1920), American geologist, + -ite1.
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