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Phoxite, (NH 4 ) 2 Mg 2 (C 2 O 4 )(PO 3 OH) 2 (H 2 O) 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, somecontaining NH + . Other secondary minerals found in association with phoxite are antipinite, aphithitalite,  4 bassanite, struvite, thenardite, and weddellite. Crystals of phoxite are colorless composite blades upto about 0.4 mm. The streak is white, and the luster is vitreous to oily. The Mohs hardness is 2½, 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 α = 1.499(1), β = 1.541(1), γ = 1.542(1) (white light); 2 V  = 16(1)°; dispersion  r  &lt;  v , slight; orientation  Y  =  b ,  X  ^  a  ≈ 9° in obtuse β. Electron microprobe analyses yielded the empirical formula [(NH 4 ) 1.77 K 0.23 ] Σ2 Mg 2.00 (C 2 O 4 )(PO 3 OH) 2 (H 2 O) 4 , with the C and H content inferred from the crystal structure. Raman spectroscopy confirmed the presence of NH 4  and C 2 O 4 . Phoxite is monoclinic,  P 21/ c , with  a  = 7.2962(3),  b  = 13.5993(4),  c  = 7.8334(6) Å, β = 108.271(8)°,  V  = 738.07(7) Å 3 , and  Z  = 2. In the crystal structure of phoxite ( R  1  = 0.0275 for 1147  I  o  &gt; 2σ I  reflections), bidentate linkages between C 2 O 4  groups and Mg-centered octahedra yield chains, which link to one another via PO 3 OH tetrahedra to create undulating [Mg 2 (C 2 O 4 )(PO 3 OH) 2 (H 2 O) 4 ] 2–  sheets. Strong hydrogen bonds link the sheets into a “soft framework,” with channels containing  44 NH + . The NH +  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.

Phoxite, (NH 4 ) 2 Mg 2 (C 2 O 4 )(PO 3 OH) 2 (H 2 O) 4 , the first phosphate-oxalate mineral