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Iddingsite: MgO.Fe2O3.3SiO2·4(H2O)
Comments: Red iddingsite with green olivine. Iddingsite alteration of olivine commonly seen in thin-sections is actually a fine-grained mixture of goethite+quartz+chlorite. Location: Amboy, San Bernadino County, California, USA. Scale: Specimen Size 5x5x3 cm. © John Betts - Fine Minerals