## The Crystal Chemistry of the Amphiboles. III: Refinement of the Crystal Structure of a Sub-Silicic Hastingsite

F. C. Hawthorne and H. D. Grundy

Department of Earth Sciences, University of Manitoba, Winnipeg, Manitoba, Canada

Department of Geology, McMaster University, Hamilton, Ontario, Canada L8S 4M1

**Summary:** Three-dimensional counter-diffractometer data and a full-matrix least-squares method have been used to refine the crystal structure of a sub-silicic hastingsite in the space group *C2/m*. The chemical composition of the amphibole is Na0·95K0·30Ca1·74(Mg1·17Fe2·172+Mn0·04Ti0·39Fe0·793+Al0·58)Si5·27Al2·73O22·56(OH)1·44 with ceil parameters *a* = 9·8659(4), *b* = 18·0139(8), *c* = 5·3545(2)Å, and *β* = 105·082(1)°. Unit weights were used throughout the refinement and the final *R*-factor for 1263 observed non-equivalent reflections was 4.1%. The mean tetrahcdral bond length for aluminous amphiboles varies linearly with the total amount of tetrahedral A1. Curves are derived relating individual mean bond lengths with A1 occupancy. The positional disorder on the *A*-site of the aluminous amphiboles appears to be partly related to the amount of substitution of A1 into the *T*(2) tetrahedron.