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Much Limonite, especially the fibrous type, is either Goethite or alter ed Goethite that absorbed water in its chemical structure. Limonite commonly forms as a pseudomorph over other minerals, especially Pyrite, Marcasite and Siderite.
The main rock types are principally distinguished by the presence or absence of the main minerals plagioclase, clinopyroxene, orthopyroxene, olivine, Fe-Ti oxides, and apatite. Sulfide minerals, brown hornblende, and biotite are additionally present in many of the examined samples in total proportions <1%-2%.