Zanazzi P F , Chelazzi L , Bonazzi P , Bindi L , American Mineralogist , 94 (2009) p.352-358, High-pressure structural behavior of ingersonite, Ca3Mn2+Sb45+O14:, An in-situ single-crystal X-ray study, Locality: Langban mine, Varmland, Sweden, Note: P = 7.42 GPa