view article
Figure 6
Dreier silicate chains, (top) unfolded and (bottom) viewed along the chain direction. (a) Dreier single tetrahedra chain (pectolite-like). (b) Dreier double chain (xonotlite-like). (c) Unfolded drawing of the tubular dreier triple chain in frankamenite and miserite. (d) Loop-branched dreier single chain. (e) Unfolded tubular loop-branched dreier triple chain in charoite and denisovite. Rows of superimposed tetrahedra along the tubular axis are indicated by arrowheads. In panels (b), (c) and (e), eight-membered rings of tetrahedra exist, `8MR'.

IUCrJ
Volume 4| Part 3| May 2017| Pages 223-242
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517002585