Phoxite, (NH4)2Mg2(C2O4)(PO3OH)2(H2O)4, the first phosphate-oxalate mineral

被引:11
作者
Kampf, Anthony R. [1 ]
Celestian, Aaron J. [1 ]
Nash, Barbara P. [2 ]
Marty, Joe [3 ]
机构
[1] Nat Hist Museum Los Angeles Cty, Mineral Sci Dept, 900 Exposit Blvd, Los Angeles, CA 90007 USA
[2] Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA
[3] 5199 East Silver Oak Rd, Salt Lake City, UT 84108 USA
关键词
Phoxite; new mineral species; phosphate; oxalate; crystal structure; Rowley mine; Arizona; BOND-VALENCE PARAMETERS; HYDROTHERMAL SYNTHESIS; CRYSTAL;
D O I
10.2138/am-2019-6991
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Phoxite, (NH4)(2)Mg-2(C2O4)(PO3OH)(2)(H2O)(4), is a new mineral species from the Rowley mine, Maricopa County, Arizona, U.S.A., and it has potential uses in agricultural applications for soil conditioning, fertilizing, and as a natural pesticide. It was found in an unusual bat-guano-related, post-mining assemblage of phases that include a variety of vanadates, phosphates, oxalates, and chlorides, some containing NH4+. Other secondary minerals found in association with phoxite are antipinite, aphithitalite, bassanite, struvite, thenardite, and weddellite. Crystals of phoxite are colorless composite blades up to about 0.4 mm. The streak is white, and the luster is vitreous to oily. The Mohs hardness is 21/2, the tenacity is brittle, fracture is irregular, there is fair {100} cleavage, and the measured density is 1.98(2) g/cm(3). Phoxite is optically biaxial (-) with alpha = 1.499(1), beta = 1.541(1),. = 1.542(1) (white light); 2V = 16(1)degrees; dispersion r < v, slight; orientation Y = b, X<^> a approximate to 9 degrees in obtuse beta. Electron microprobe analyses yielded the empirical formula [(NH4)(1.77)K-0.23](Sigma 2)Mg-2.00(C2O4)(PO3OH)(2)(H2O)(4), with the C and H content inferred from the crystal structure. Raman spectroscopy confirmed the presence of NH4 and C2O4. Phoxite is monoclinic, P2(1)/c, with a = 7.2962(3), b = 13.5993(4), c = 7.8334(6) angstrom, beta = 108.271(8)degrees, V = 738.07(7) angstrom(3), and Z = 2. In the crystal structure of phoxite (R-1 = 0.0275 for 1147 I-o > 2 sigma I reflections), bidentate linkages between C2O4 groups and Mg-centered octahedra yield chains, which link to one another via PO3OH tetrahedra to create undulating [Mg-2(C2O4)(PO3OH)(2)(H2O)(4)](2-) sheets. Strong hydrogen bonds link the sheets into a "soft framework," with channels containing NH4+. The NH4+ forms both ordered hydrogen bonds and electrostatic bonds with O atoms in the framework. Phoxite is the first mineral known to contain both phosphate and oxalate groups as essential components.
引用
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页码:973 / 979
页数:7
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