Purified illite tends to be beige or only slightly green in hand specimen. Glauconite greenish ferric iron silicate mineral with micaceous structure k na fe3 al mg 2 si al 4o10 οh 2 characteristically formed on submarine elevations ranging in depth from 30 to 1 000 metres 100 to 3 300 feet below sea level. Glauconite is an iron rich clay restricted to marine environments.
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