Gillespite group of silicates.

This document is part of Subvolume I5α ‘Phyllosilicates' of Volume 27 ‘Magnetic properties of non-metallic inorganic compounds based on transition elements' of Landolt-Börnstein - Group III ‘Condensed Matter'. It presents silicates belonging to the gillespite group with regard to their crystal structures, lattice parameters, magnetic properties, nuclear gamma resonance (NGR) data and optical properties. Mineral names contained in this document: cuprorivaite, effenbergerite, gillespite, wesselsite. Substances contained in this document (element systems and chemical formulae): A-Cr-O-Si: ACrSi4O10 (A = Ca, Sr, Ba). A-Cu-O-Si: ACuSi4O10 (A = Ca, Sr, Ba). A-M-O-Si: AMSi4O10 (A = Ca, Sr, Ba; M = Cr, Cu, Fe). Ba-Cr-O-Si: BaCrSi4O10. Ba-Cu-O-Si: BaCrSi4O10. Ba-Fe-O-Si: BaFeSi4O10. Ca-Cr-O-Si: CaCrSi4O10. Ca-Cu-O-Si: CaCuSi4O10. Cr-M-O-Si: MCrSi4O10 (M = Ca, Sr, Ba). Cr-O-Si-Sr: SrCrSi4O10. Cu-O-Si-Sr: SrCuSi4O10. [ABSTRACT FROM AUTHOR]