gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1953.030.221.03 The Mineralogy of the Antimony Oxides and Antimonates Mason Brian Ph.D. Vitaliano Charles J. Ph.D. Indiana University, Bloomington, Indiana, U.S.A. 6 1953 30 221 100 112 Copyright © 1953, The Mineralogical Society 1953 Summary

The mineralogy of the antimony oxides and antimonates is summarized in table VI. Apart from the polylnorphs of Sb2O3, senarmontite

Table VI. Mineralogy of the antimony oxides and antimonates

Senarmontite Sb2O3 Cubic
Valentinite Sb2O3 Orthorhombic
Stibiconite (Sb3+, Ca)ySb2-x(O,OH,H2O)6-7 Cubic
Bindheimite PbySb2-x(O,OH,H2O)6-7 Cubic
Stetefeldtite AgySb2-x(O,OH,H2O)6-7 Cubic
Partzite CuySb2-x(O,OH,H2O6-7 Cubic
Tripuhyite Fe1-ySb1-x(O,OH)4 Tetragonal
Byströmite Mg1-ySb2-x(O,OH)6 Tetragonal
and valentinite, they fall into two structural groups, a cubic group with the pyrochlore structure and a tetragonal group with the trirutile structure. When the antimony is associated with large cations the pyrochlore structure is stable; with smaller cations the trirutile structure is the stable form. Defect lattices are usual in these minerals, resulting in great variability of chemical composition and in physical and optical properties within the individual species.