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Ferriphoxite and carboferriphoxite: two new oxalato–phosphate minerals from the Rowley mine, Arizona, USA

Published online by Cambridge University Press:  11 November 2024

Anthony R. Kampf Open the ORCID record for Anthony R. Kampf [Opens in a new window] ,
Chi Ma Open the ORCID record for Chi Ma [Opens in a new window] ,
Frank C. Hawthorne Open the ORCID record for Frank C. Hawthorne [Opens in a new window]  and
Joe Marty
Anthony R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA;
Frank C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
Joe Marty
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
*
Corresponding author: Anthony R. Kampf; Email: akampf@nhm.org
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Abstract

Ferriphoxite, [(NH4)2K(H2O)][Fe3+(HPO4)2(C2O4)], and carboferriphoxite, [(NH4)K(H2CO3)][Fe3+(HPO4)(H2PO4)(C2O4)], are new mineral species from the Rowley mine, Maricopa County, Arizona, USA. They occur with antipinite, aphthitalite, baryte, fluorite, hematite and quartz in an unusual bat-guano-related, post-mining assemblage. Ferriphoxite occurs as rectangular blades, up to ∼0.1 mm in length, typically forming sprays. Carboferriphoxite occurs as needles or blades, up to ∼0.2 mm in length, typically forming fan- and bowtie-like sprays. Both species are colourless with white streak, vitreous lustre, ∼2 Mohs hardness, brittle tenacity and splintery fracture. Ferriphoxite has three good cleavages ({100}, {010} and {001}) and carboferriphoxite has two good cleavages (probably {100} and {001}). Both species have a measured density of 2.14(2) g·cm–3. Ferriphoxite is biaxial (+) with α = 1.524(3), β = 1.560(3), γ = 1.608(3) and 2Vmeas. = 83.9(4)°. Carboferriphoxite is biaxial (+) with α = 1.525(3), β = 1.555(calc), γ = 1.630(3) and 2Vmeas. = 67(1)°. Electron probe microanalysis gave {[(NH4)2.13K0.87]Σ3.00(H2O)} {(Fe3+0.95Al0.05)Σ1.00(HPO4)2(C2O4)} for ferriphoxite and {[(NH4)1.12K0.88]Σ2.00(H2CO3)} {(Fe3+0.78Al0.22)Σ1.00(HPO4)(H2PO4)(C2O4)} for carboferriphoxite. Ferriphoxite is monoclinic, P21/c, with a = 11.389(5), b = 6.352(3), c = 18.716(9), β = 102.887(9)°, V = 1319.8(11) Å3 and Z = 4. Carboferriphoxite is triclinic, P$\bar 1$, with a = 6.4405(3), b = 9.399(5), c = 11.839(6) Å, α = 95.763(10), β = 92.314(10), γ = 100.665(8)°, V = 695.6(6) Å3 and Z = 2. The structures of ferriphoxite (R1 = 0.0678 for 1850 I > 2σI reflections) and carboferriphoxite (R1 = 0.0427 for 3602 I > 2σI reflections) both contain double-strand chains of corner-sharing Fe3+O6 octahedra and PO3(OH) tetrahedra. The chain in ferriphoxite is decorated by PO3OH tetrahedra and C2O4 groups and that in carboferriphoxite is decorated by PO2(OH)2 tetrahedra and C2O4 groups. The interstitial units in both structures contain K+ and NH4+ cations along with a H2O group in ferriphoxite and an H2CO3 group in carboferriphoxite.

Keywords

ferriphoxitecarboferriphoxitenew mineral speciesoxalatephosphatecrystal structureRowley mine, Arizona

Information

Type
Article
Information
Mineralogical Magazine , Volume 89 , Issue 1 , February 2025 , pp. 162 - 171
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: Peter Leverett

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