A New Langbeinite: Dipotassium Dimanganese Tetrafluoroberyllate Guelylah, A. ; Breczewski, T. ; Madariaga, G. Abstract Publication: Acta Crystallographica Section C Pub Date: December 1996 DOI: 10.1107/S0108270196008827 Bibcode: 1996AcCrC..52.2951G