AM_Koragoite
Formula: Mn3.16 Fe.1 Ta.652 W1.807 Nb3.6 Ti.09 O20
Name: Koragoite
Unit cell: 24.73 5.056 5.76 90.0 103.5 90.0 , V=700.30
Space group: P1211 (4)

Yamnova N A , Pushcharovskii D Yu , Voloshin A V , Kristallografiya , 40 (1995) p.469-475, Crystal structure of a new natural Mn, W-tantaloniobate