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Rowleyite, [Na(NH4,K)9Cl4][V25+,4+(P,As)O8]6·n[H2O,Na,NH4,K,Cl]⁠, a new mineral with a microporous framework structure by Anthony R. Kampf1,*,Mark A. Cooper2,Barbara P. Nash3,Thure E. Cerling3,Joe Marty4,Daniel R. Hummer5,Aaron J. Celestian1,Timothy P. Rose6,and Thomas J. Trebisky7 is a Earth and Planetary Sciences article available to read on EtoBox.

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Rowleyite, [Na(NH 4 ,K) 9 Cl 4 ][V 2 5+,4+ (P,As)O 8 ] 6 •n[H 2 O,Na,NH 4 ,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 NH 4 + . 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 δ 13 C 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/cm 3 . Rowleyite is optically isotropic with n = 1.715(5). Electron microprobe analyses yielded the empirical formula [(NH 4 ) 8.81 Na 3.54 K 2.58 ) Σ14.93 Cl 6.29 (H 2 O) 16 ][(V 5+

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Author

Anthony R. Kampf1,*,Mark A. Cooper2,Barbara P. Nash3,Thure E. Cerling3,Joe Marty4,Daniel R. Hummer5,Aaron J. Celestian1,Timothy P. Rose6,and Thomas J. Trebisky7

Publisher

Mineralogical Society of America; Walter de Gruyter GmbH (ISSN 0003-004X)

Published

2017

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)