The ludwigite group includes:
azoproite:
Mg2[(Ti,Mg),Fe3+]O2(BO3)
bonaccordite:
Ni2Fe3+O2(BO3)
fredrikssonite:
Mg2Mn3+O2(BO3)
ludwigite:
Mg2Fe3+O2(BO3)
savelievaite:
Mg2Cr3+O2(BO3)
vonsenite:
Fe2+2Fe3+O2(BO3)
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