A mineral or mineralogical term; a form of manganese oxide or related mineral compound.
From 'grout' (possibly from Old English 'grut' meaning coarse grain) plus '-ite' (mineralogical suffix indicating a mineral, from Greek 'lithos' meaning stone). Created in geological nomenclature.
Groutite is named after Walter Grout, a mineralogist—it's a manganese oxyhydroxide mineral that shows how scientists honor colleagues by naming new mineral discoveries after them, creating a hidden history of scientists in geology.
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