A rare calcium manganese phosphate mineral, Ca₂(Mn,Fe)₂(PO₄)₂F₂, found in some pegmatite deposits.
Named after the Fairfield locality where it was discovered, plus the mineralogical suffix '-ite' (used to name minerals). Named in honor of a specific geographic location following mineralogical naming conventions.
Minerals are named after places and people, so 'fairfieldite' is basically a geological memento—whenever geologists discover a new mineral, they immortalize a location or person by adding '-ite,' creating a permanent record of discovery.
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