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THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe₃O₈, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

Luca Bindi and Curzio Cipriani

Museo di Storia Naturale – sez. di Mineralogia e Litologia – Università degli Studi di Firenze, via La Pira 4, I–50121 Firenze, Italy

E-mail address: lbindi{at}steno.geo.unifi.it

We have refined the crystal structure of winstanleyite from the type locality, the Grand Central mine, Tombstone, Arizona, in space group I2₁/a to a final R index of 2.03%. Unit-cell parameters of the crystal examined are: a 10.965(1) Å, V 1318.3(2) ų, Z = 8. The structure previously reported for the synthetic analogue was confirmed, although a higher precision of refinement was achieved. The crystal-chemical environment of both Ti and Te cations is considered in relation with that in other tellurite structures.

Keywords: winstanleyite, walfordite, crystal-structure refinement, Tombstone, Arizona.

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