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Ludwigite is a mineral with the chemical formula (Mg, Fe)₂FeBO₅. It is an iron magnesium borate that typically appears in fibrous masses and is blackish-green in color. The mineral was named after Ernst Ludwig, an Austrian chemist.1

Ludlamite, a different mineral, has the formula (Fe,Mg,Mn)₃(PO₄)₂·4H₂O and is a hydrous iron phosphate that forms small, green, transparent crystals.2

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