Ring silicates

Island silicates containing discrete ions. Orthosilicates, SiO " (Q ) pyrosilicates, Si O " (Q ) and ring silicates, SigO,", SieOir (Q ). 

Fig. 5.18. The Si L2 3 x-ray emission spectra of various silicates, as shown, and of quartz. In terms of structural silicate groups (1-7) are island silicates, (8-9) ring silicates, (10-U) single-chain silicates, (12-15) double-chain silicates, (16-19) sheet silicatesj (20-22) framework silicates (after Dikov et al., 1976 reproduced with the publisher s permission).

Deer, W. A., R. A.. Howie, and J. Zussman (1986). Rock Forming Minerals, Vol. IB Disilicates and Ring Silicates. London Longmans. 

Cyclic or Ring Silicates If two oxygen atoms per tetrahedron are shared to form closed rings such that... 

Ring silicates Beryl Rings of Si04 tetrahedra High cristobalite 0.713 2.32... 

Rumanova, I.M., Volodina, G.F., and Belov, N.V. (1966) Crystal stmcture of the rare-earth ring silicate kainosite, Kristallografiya, 11,549. 

Figure 14. Formation of ZSM-5 via ring opening and polymerization of double 5-ring silicate anions [37]. = isolated tetrahedral site.

Groenen, E.J.J., Kortbeek, AG.TG., Mackay, M. and Sudmeijer, O. (1986) Double-ring silicate anions in tetraall lammonium hydroxide/silicate solutions their possible role in the synthesis of silicon rich zeolites . Zeolites 6,403-411. 

Bissert, G. and Liebau, F. (1984) "Cubic [N(C4H9)4]H7[Si8O20]- 5.33 H2O-A double ring silicate with a zeolite like structure and (H20)i6 water clusters", Acta CiysL A40, C-232. 

Figure 11. Branched ring silicate complexes In the structures of (a) eakerite Ca2SnAl2lSiQ0 fJ(0H) H20 (b) tienshanite...

The cyclosilicates (ring silicates) consist of 3- to 6-membered rings of corner-shared tetrahedrons, where each tetrahedron is linked to exactly two others. The formulas of the basic building blocks for the 3-, 4-, 5-, and 6-membered... 

---