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Ludwigite group

[ A²⁺₂ ][ B³⁺ ][O₂|BO₃]

• [ Mg ][ Fe ]: Ludwigite
• [ Fe ][ Fe ]: Vonsenite
• [ Ni ][ Fe ]: Bonaccordite
• [ Mg ][ Mn ]: Fredrikssonite
• [ Mg ][ (Fe,Ti) ]: Azoproite
• [ Mg ][ (Fe,Sb⁵⁺) ]: Chestermanite

• Class: Borate
• System: Orthorhombic