AM_Sinkankasite Formula: Mn P2 Al O15 H15 Name: Sinkankasite Unit cell: 9.59 9.818 6.86 108.04 99.63 98.87 , V=590.69 Space group: P-1 (2)

Burns P C , Hawthorne F C , American Mineralogist , 80 (1995) p.620-627, The crystal structure of sinkankasite, a complex heteropolyhedral sheet mineral, Locality: Barker pegmatite, near Keystone, Pennington County, South Dakota, USA