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The minerals zunyite, Al 13 Si 5 O 20 (OH 9 F) 18 Q 5  and harkerite, Ca 24 Mg g [AlSi 4 (O 5 OH)  16 ] 2 - (CO 3 ) 8 (BO 3 ) 8 (H 2 O 9 Q) 5  have been studied by means of solid-state  27 Al MAS NMR. Zunyite contains Si 5 O 16  pentamers and harkerite contains AlSi 4 (O 5 OH) 16  pentamers. These pen- tameric groups are unique because their T-O-Si angles are almost 180°. Chemical analysis of the zunyite sample shows that it has excess Al: the Al-Si ratio is 2.9, compared with the ideal of 2.6.

Solid-state MAS NMR study of pentameric aluminosilicate groups with 180° intertetrahedral AI-Q-Si angles in zunyite and harkerite