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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


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Volume 102, Issue 5

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Rowleyite, [Na(NH4,K)9Cl4][ V25+,4+(P,As)O8]6n[H2O,Na,NH4,K,Cl], a new mineral with a microporous framework structure

Anthony R. Kampf
  • Corresponding author
  • Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, U.S.A.
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/ Mark A. Cooper / Barbara P. Nash / Thure E. Cerling / Joe Marty / Daniel R. Hummer / Aaron J. Celestian
  • Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, U.S.A.
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/ Timothy P. Rose
  • Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, U.S.A.
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/ Thomas J. Trebisky
  • MMT Observatory, University of Arizona, 1540 East Second Street, Tucson, Arizona 85721, U.S.A.
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Published Online: 2017-05-06 | DOI: https://doi.org/10.2138/am-2017-5977

Abstract

Rowleyite, [Na(NH4,K)9Cl4][ V25+,4+(P,As)O8]6n[H2O,Na,NH4,K,Cl], is a new mineral species from the Rowley mine, Maricopa County, Arizona, U.S.A. It was found in an unusual low-temperature, apparently post-mining suite of phases that include various vanadates, phosphates, oxalates, and chlorides, some containing NH4+. Other secondary minerals found in association with rowleyite are antipinite, fluorite, mimetite, mottramite, quartz, salammoniac, struvite, vanadinite, willemite, wulfenite, and several other potentially new minerals. Analyzed δ13C values for the antipinite in association with rowleyite are consistent with a bat guano source. Crystals of rowleyite are very dark brownish green (appearing black) truncated octahedra up to about 50 μm in diameter. The streak is brownish green, the luster is vitreous, very thin fragments are transparent. The Mohs hardness is about 2, the tenacity is brittle, fracture is irregular, there is no cleavage, and the measured density is 2.23(2) g/cm3. Rowleyite is optically isotropic with n = 1.715(5). Electron microprobe analyses yielded the empirical formula [(NH4)8.81Na3.54K2.58)Σ14.93Cl6.29(H2O)16] [(V9.365+V2.644+)Σ12(P5.28As0.725+)Σ6O48]. Raman and infrared spectroscopy confirmed the presence of NH4 and H2O. Rowleyite is cubic, Fd3¯m, with a = 31.704(14) Å, V = 31867(42) Å3, and Z = 16. The crystal structure of rowleyite (R1 = 0.040 for 1218 Fo > 4σF reflections) contains [V4O16]12+ polyoxovanadate units that link to one another via shared vertices with [(P,As)O4]3– tetrahedra to form a 3D framework possessing large interconnected channels. The channels contain a 3D ordered [Na(NH4,K)9Cl4]6+ salt net, which apparently served as a template for the formation of the framework. In that respect, rowleyite can be considered a salt-inclusion solid (SIS). The rowleyite framework is among the most porous known.

Keywords: Rowleyite; new mineral species; polyoxovanadate; microporous framework; salt-inclusion solid; crystal structure; Rowley mine; Arizona

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About the article

Received: 2016-10-05

Accepted: 2016-12-28

Published Online: 2017-05-06

Published in Print: 2017-05-24


Citation Information: American Mineralogist, Volume 102, Issue 5, Pages 1037–1044, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2017-5977.

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© 2017 by Walter de Gruyter Berlin/Boston.

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