AM_Holdenite Formula: Mn5.45 Mg.55 Si As2 Zn3 O20 H8 Name: Holdenite Unit cell: 11.99 31.46 8.697 90.0 90.0 90.0 , V=3280.55 Space group: ABMA (64)

Moore P B , Araki T , American Mineralogist , 62 (1977) p.513-521, Holdenite, a novel cubic close-packed structure, Note: sample is from the zinc mines at Franklin, Sussex County, New Jersey, USA