AM_Santaclaraite Formula: Mn4.03 Ca.92 Mg.05 Si5 O17 H4 Name: Santaclaraite Unit cell: 10.273 11.91 12.001 105.77 110.64 89.13 , V=1317.06 Space group: I-1 (2)

Ohashi Y , Finger L W , American Mineralogist , 66 (1981) p.154-168, The crystal structure of santaclaraite, CaMn4[Si5O14(OH)](OH)*H2O: The role of, hydrogen atoms in the pyroxenoid structure, Note: gamma angle revised according to Am Min 66 (1981) 1281