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Wrightite, K2Al2O(AsO4)2, a new oxo-orthoarsenate from the Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka peninsula, Russia

Published online by Cambridge University Press:  15 May 2018

Andrey P. Shablinskii ,
Stanislav K. Filatov ,
Lidyua P. Vergasova ,
Eugeniya Yu. Avdontseva  and
Svetlana V. Moskaleva
Andrey P. Shablinskii
Affiliation:
Institute of Earth Science, Saint-Petersburg State University, University Emb. 7/9., 199034, Saint-Petersburg, Russia Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova Emb. 2., 199034, Saint-Petersburg, Russia
Stanislav K. Filatov*
Affiliation:
Institute of Earth Science, Saint-Petersburg State University, University Emb. 7/9., 199034, Saint-Petersburg, Russia
Lidyua P. Vergasova
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006 Petropavlovsk-Kamchatsky, Russia
Eugeniya Yu. Avdontseva
Affiliation:
Institute of Earth Science, Saint-Petersburg State University, University Emb. 7/9., 199034, Saint-Petersburg, Russia
Svetlana V. Moskaleva
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006 Petropavlovsk-Kamchatsky, Russia
*
*E-mail: [email protected]
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Abstract

The new mineral wrightite, K2Al2O(AsO4)2, was found in 1983 at a fumarole on the Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka peninsula, Russia, where it occurs as light yellow aggregates of transparent tabular crystals, with an average size of 0.05 mm × 0.03 mm × 0.005 mm. Wrightite is orthorhombic, space group Pnma, with the unit-cell parameters a = 8.230(5), b = 5.555(4), c = 17.584(1) Å, V = 803.9(6) Å3 and Z = 4 (from powder data). The empirical formula is (K1.69Na0.38)Σ2.07(Al1.80Fe0.24)Σ2.04As1.96O9. The crystal structure (R1 = 0.043) consists of Al2O(AsO4)2 layers in the ab plane with clusters of edge-sharing AlO6 octahedra. Each layer contains two independent isolated AsO4 tetrahedra and two AlO6 octahedra. AlO6 octahedra are linked by edges, forming zigzag chains along the b axis inside the Al–As layer. Eight- and six-coordinated K atoms are located in the interlayer space between Al2O(AsO4)2 layers. The mineral is biaxial (−), α =1.679(2), β =1.685(2), γ (calc.) =1.687; 2V(meas.) = 62(10)° (λ = 589 nm). The strongest lines in the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 8.77(36)(002); 4.458(17)(111); 4.010(19)(201,013); 3.875(19)(104) and 2.972(100)(015). The mineral was named in honour of Adrian Carl Wright, Emeritus Professor at the University of Reading, UK.

Keywords

wrightitenew mineral speciesoxo-orthoarsenatecrystal structurefumarole mineralsKamchatka peninsula
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 6 , December 2018 , pp. 1243 - 1251
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Andrew Christy

References

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