Wadeite is a cyclosilicate having three-membered rings. The 3-membered silica rings are bonded to zirconium (Zr) to form the backbone structure. Potassium (K) is the charge-balancing cation in this instance.
Highlighting FeaturesSilicon (Si) atoms Zirconium (Zr) atoms Oxygen (O) atoms Potassium (K) atoms Silicate backbone A single 3-membered ring All atoms
Wadeite can be found in Australia and Russia. It is of rare occurrence, but is a good example of a 3-membered cyclosilicate ring structure.
Swanson, D. K. and C.T. Prewitt. 1983. The crystal structure of K2SiSi3O9. American Mineralogist 68:581-585