The ludwigite group includes: azoproite: Mg2[(Ti,Mg),Fe3+]O2(BO3) bonaccordite: Ni2Fe3+O2(BO3) fredrikssonite: Mg2Mn3+O2(BO3) ludwigite: Mg2Fe3+O2(BO3) vonsenite: Fe2+2Fe3+O2(BO3) Back to Minerals