Abstract
Unusual variety of forsterite strongly enriched by pentavalent constituents, phosphorus and arsenic (up to 12.9 wt% P2O5 and up to 16.0 wt% As2O5) was found in sublimates of the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia, in association with As- and P-depleted forsterite, anhydrite, diopside, hematite, spinel, haüyne, fluorapatite, svabite, berzeliite, calciojohillerite, and arsenudinaite. This forsterite is the P-richest natural olivine which also demonstrates first case of As incorporation in an olivine-type silicate. P- and As-rich forsterite is orthorhombic, space group Pbnm, unit-cell parameters are: a = 4.7762(2), b =10.2643(4), c = 5.9646(2) Å and V = 292.41(2) Å3. Its crystal structure was solved on single crystal and refined to R = 2.88%. The crystal chemical formula is M(1)(Mg0.83[vac]0.17)M(2)(Mg0.95[vac]0.05)[Si0.56P0.32As0.12]O4. The substitution scheme for the incorporation of pentavalent constituents in forsterite is: VIMg2+ + 2IVSi4+ ↔ VI[vac]0 + 2IVT5+, in which T5+ = P, As and [vac] = vacancy. No sign of vacancies in the tetrahedrally coordinated T site is found.
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Acknowledgements
We thank two anonymous referees for valuable comments. We are grateful to Dmitry A. Varlamov for his assistance in electron microprobe studies and Pavel Yu. Plechov for discussion. This work was supported by the Russian Foundation for Basic Research, Grant no. 17-05-00179 (in part of mineralogical and structural studies) and the Russian Science Foundation, Grant no. 19-17-00050 (in part of crystal chemical analysis).
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Shchipalkina, N.V., Pekov, I.V., Zubkova, N.V. et al. Natural forsterite strongly enriched by arsenic and phosphorus: chemistry, crystal structure, crystal morphology and zonation. Phys Chem Minerals 46, 889–898 (2019). https://doi.org/10.1007/s00269-019-01048-8
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DOI: https://doi.org/10.1007/s00269-019-01048-8