Monoclinic structure and nonstoichiometry of `KAlSiO4-O1'
Article first published online: 13 MAR 2013
International Union of Crystallography, 2013
Acta Crystallographica Section C
Volume 69, Issue 4, pages 334–336, April 2013
How to Cite
Kremenović, A., Lazic, B., Krüger, H., Tribus, M. and Vulić, P. (2013), Monoclinic structure and nonstoichiometry of `KAlSiO4-O1'. Acta Crystallographica Section C, 69: 334–336. doi: 10.1107/S0108270113006069
- Issue published online: 11 APR 2013
- Article first published online: 13 MAR 2013
- Received 19 November 2012, accepted 3 March 2013
Crystals of KAlSiO4-O1 (potassium aluminium silicate) were synthesized using a flux method and analysed utilizing single-crystal X-ray diffraction and electron microprobe analysis. Both methods confirm that the crystals are nonstoichiometric according to K1−xAl1−xSi1+xO4 with x = 0.04 (1). KAlSiO4-O1 is closely related to the stuffed derivatives of tridymite, although the topology of the Si/Al-ordered framework is different. Six-membered rings of UUDDUD and UUUDDD (U = up and D = down; ratio 2:1) configurations are present in layers parallel to the ab plane. In contrast, the framework of tridymite exhibits UDUDUD rings. The crystals are affected by inversion, pseudo-orthorhombic and pseudo-hexagonal twinning.