It occurs as a secondary mineral in copper deposits in association with olivenite, chalcophyllite, clinoclase, cornwallite, strashimirite, malachite, cuprite and limonite.
en.wikipedia.org These sediments consist of eolian quartz, clay minerals, volcanic ash, subordinate residue of siliceous microfossils, and authigenic minerals such as zeolites, limonite and manganese oxides.
en.wikipedia.org Nickel content is higher in the saprolite zone although cobalt is an important by-product of the limonite horizon.
en.wikipedia.org The other less common creedite association is creedite limonite kaolinite hemimorphite smithsonite hydrozincite aurichalcite.
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