AM_Ludwigite_1 Formula: Mg3.91 Fe1.11 Mn.54 Al.44 B2 O10 Name: Ludwigite Unit cell: 9.24 12.362 2.9869 90.0 90.0 90.0 , V=341.18 Space group: PBAM (55)

Holtstam D , Neues Jahrbuch fur Mineralogie, Monatshefte , 2001 (2001) p.520-528, Crystal chemistry of a manganian ludwigite, Note: z-coordinate has been altered through personal communication with the author, Locality: Jakobsberg Fe-Mn oxide deposit, Filipstad, Varmland, Sweden