The fluoride phosphates or phosphate fluorides are inorganic double salts that contain both fluoride and phosphate anions. In mineralogy, Hey's Chemical Index of Minerals groups these as 22.1. The Nickel-Strunz grouping is 8.BN.

Related mixed anion compounds are the chloride phosphates, the fluoride arsenates and fluoride vanadates.

They are distinct from the fluorophosphates: monofluorophosphate, difluorophosphate and hexafluorophosphate which have fluorine bonds to the phosphorus.

Minerals

nameformularatio PO4:Fformula weightcrystal systemspace groupunit cellvolumedensityrefractive indexcommentreferenceAlthausiteMg4(PO4)2(OH,O)(F,☐)2:~1OrthorhombicPnmaa = 8.258 b = 6.054, c = 14.383719.062.97Biaxial (+) nα = 1.588 nβ = 1.592 nγ = 1.598 2V: measured: 70° , calculated: 80°

Max birefringence: δ = 0.010AmblygoniteLiAl(PO4)F1:1TriclinicPa = 6.644 b = 7.744 c = 6.91 α = 90.35°, β = 117.33°, γ = 91.01° Z=4315.753.04-3.11Biaxial (-) nα = 1.577 - 1.591 nβ = 1.592 - 1.605 nγ = 1.596 - 1.613 2V: Measured: 107° to 129.5°

Birefringence: 0.020aravaiteBa2Ca18(SiO4)6(PO4)3(CO3)F3O3:3trigonalRma = 7.1255, c = 66.290 Z=32914.8ArctiteNa2Ca4(PO4)3F3:1TrigonalRma = 7.078 c = 41.203 Z=61,787.643.13Uniaxial (-) nω = 1.578 nε = 1.577 Birefringence: 0.001AriegilatiteBaCa12(SiO4)4(PO4)2F2OTrigonalRma = 7.1551 c = 41.3031381.2Uniaxial (-) nω = 1.650 nε = 1.647 Max Birefringence: δ = 0.003BabefphiteBaBePO4(F,OH)1:~1TetragonalUniaxial (+) nω = 1.629 nε = 1.632

Max birefringence: δ = 0.003Belovite-(Ce)NaCeSr3(PO4)3F3:1TrigonalPa = 9.692 c = 7.201585.804.19Uniaxial (-) nω = 1.653 - 1.660 nε = 1.634 - 1.640 Birefringence: 0.015Belovite-(La)NaLaSr3(PO4)3F3:1TrigonalPa = 9.647 c = 7.17577.884.19Uniaxial (-) nω = 1.653 nε = 1.635 - 1.636 Max birefringence: δ = 0.018BøggilditeNa2Sr2Al2PO4F91:9MonoclinicBiaxial (+) nα = 1.462 nβ = 1.466 nγ = 1.469 2V: 80° Max birefringence:δ = 0.007Carlgieseckeite-(Nd)NaNdCa3(PO4)3FTrigonalPa = 9.4553 c = 6.9825540.623.91CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2O2:2MonoclinicP21/ba = 4.9573 b = 12.1824 c = 18.9749 β = 90.933° Z=41145.782.525Biaxial (-) nα = 1.548(2) nγ = 1.550(2) 2V: calculated: 56°

Max brefringence: δ = 0.002Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5TrigonalP3a = 9.51 c = 7.01 Z=2549.053.92Uniaxial (-) nω = 1.682 nε = 1.660 Max birefringence: δ = 0.022FluelliteAl2(PO4)F2(OH) · 7H2OOrthorhombicFddda = 11.22 b = 21.15 c = 8.542,0272.139 - 2.17Biaxial (+) nα = 1.473 - 1.490 nβ = 1.490 - 1.496 nγ = 1.506 - 1.511 Max birefringence: δ = 0.033FluorapatiteCa5(PO4)3F3:1HexagonalP63/ma = 9.3973 c = 6.8782526.033.1-3.25Uniaxial (-) nω = 1.631 - 1.650 nε = 1.627 - 1.646

Birefringence: 0.004FluorcaphiteSrCaCa3(PO4)3F3:1HexagonalP63/ma = 9.485 c = 7.000 Z=2545.39Uniaxial (-) nω = 1.649 nε = 1.637 Max birefringence: δ = 0.012FluorphosphohedyphaneCa2Pb3(PO4)3F3:1HexagonalP63/ma = 9.640, c = 7.012 Z=2564.45.445Uniaxial (-) nω = 1.836 nε = 1.824 Max birefringence: δ = 0.012FluorstrophiteSrCaSr3(PO4)3F3:1HexagonalP63/ma = 9.565 c = 7.115 Z=2563.74Uniaxial (-) nω = 1.651 nε = 1.637 Max birefringence: δ = 0.014FrancoliteHerderiteCaBe(PO4)FMonoclinica = 4.81, b = 7.7 c = 9.82 β = 90.1°363.73.02Biaxial (-) nα = 1.556 - 1.592 nβ = 1.578 - 1.610 nγ = 1.589 - 1.620 2V: calculated: 70°

Max birefringence: δ = 0.033IangreyiteCa2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2O4:~15TrigonalP3 2 1a = 6.988 c = 16.707706.5IsokiteCaMg(PO4)FMonoclinicB2/ba = 6.52 b = 8.75 c = 7.51 β = 121.47°365.43.15-3.27Biaxial (+) nα = 1.590 nβ = 1.595 nγ = 1.615 2V: ,easured: 51°

Max birefringence: δ = 0.025KingiteAl3(PO4)2F2(OH) · 7H2O2:2Triclinica = 9.15 b = 10 c = 7.24 α = 98.6°, β = 93.6°, γ = 93.2°BiaxialKuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.56:1TrigonalPa = 9.909 c = 7.402629.424.51LacroixiteNaAl(PO4)F1:1MonoclinicB2/ba = 6.414 b = 8.207 c = 6.885 β = 115.47°327.203.126 - 3.29Biaxial (-) nα = 1.546 nβ = 1.563 nγ = 1.580 2V: measured: 89°

Birefringence: 0.034McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2O4:1Triclinica = 10.05 b = 11.56 c = 6.88 α = 105.84°, β = 93.66°, γ = 106.47°728.7Biaxial (-) nα = 1.522 nβ = 1.531 nγ = 1.534 2V: measured: 55° to 59.7°, calculated: 58°

Max birefringence:δ = 0.012MinyuliteKAl2(PO4)2(OH,F) · 4H2O2:~1OrthorhombicPba2a = 9.34 b = 9.74 c = 5.525022.47Biaxial (+) nα = 1.531 nβ = 1.534 nγ = 1.538 2V: measured: 70° , calculated: 82°

Max birefringence: δ = 0.007Miyahisaite(Sr,Ca)2Ba3(PO4)3F3:1HexagonalP63/ma = 9.921, c = 7.469 Z=2636.74.511MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O2:4Monoclinic2.94Biaxial (-) nα = 1.551 nβ = 1.563 nγ = 1.565 2V: measured: 43° , calculated: 44°

Max birefringence: δ = 0.014NacaphiteNa2Ca(PO4)FMonoclinicP21/ba = 13.318 b = 7.0964 c = 10.6490 β = 113.526° Z=8922.81Biaxial (-) nα = 1.508 nβ = 1.515 nγ = 1.520 2V: 80° Max birefringence: δ = 0.012natrophosphateNa7(PO4)2F.19H2O2:1IsometricFd3ca = 27.79 Z=5621,461.781,71-1.72IsotropicNefedoviteNa5Ca4(PO4)4F4:1Triclinica = 5.4 Å, b = 11.64 Å, c = 16.48 Å α = 134.99°, β = 90.04°, γ = 89.96°732.60Biaxial (+) nα = 1.571 nγ = 1.590 Max birefringence: δ = 0.019Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O8:8OrthorhombicP21mna = 12.123 b = 18.999 c = 4.9612.54Biaxial (-) nα = 1.540 nβ = 1.548 nγ = 1.553 2V: measured: 76°, calculated: 76°

Max birefringence: δ = 0.013PanasqueiraiteCaMg(PO4)(OH,F)1:~1monoclinica = 6.53 b = 8.75 c = 6.91 β = 112.33°365.23.27Biaxial (+) nα = 1.590 nβ = 1.596 nγ = 1.616 2V: measured: 51° , calculated: 58°

Max birefringence: δ = 0.026RichelliteCaFe3+2(PO4)2(OH,F)22:~2a = 5.18 c = 12.61StronadelphiteSr5(PO4)3F3:1HexagonalP63/ma = 9.845 c = 7.383619.72Uniaxial (-) nω = 1.630(1) nε = 1.623(1) Max birefringence: δ = 0.007TripliteMn2+2(PO4)F1:1MonoclinicP21/ba = 11.9 b = 6.52 c = 10.09 β = 105.62°758.43.9Biaxial (+) nα = 1.650 nβ = 1.660 nγ = 1.680

2V: measured: 70° to 90°, calculated: 72°

Max birefringence: δ = 0.030VäyryneniteMn2+Be(PO4)(OH,F)1:~1MonoclinicP21/b a = 5.411 b = 14.49 c = 4.73 β = 102.75°361.713.22Biaxial (-) nα = 1.638 - 1.640 nβ = 1.658 - 1.662 nγ = 1.664 - 1.667 2V: measured: 46° to 55°, Calculated: 51° to 57°

Max birefringence: δ = 0.026 - 0.027ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)31:~3Monoclinica = 6.83 b = 7.14 c = 5.44 β = 109.37°250.27Biaxial (-) nα = 1.557 nβ = 1.565 nγ = 1.571 2V: measured: 81° , calculated: 80°

Max birefringence: δ = 0.014Wagnerite(Mg,Fe2+)2(PO4)F1:1MonoclinicP21/ba = 9.645 b = 31.659 c = 11.914 β = 108.26(3)°3454.83.15Biaxial (+) nα = 1.568 nβ = 1.572 nγ = 1.582 2V: Measured: 25° to 35°

? Birefringence:0.046

Max birefringence: δ = 0.015WavelliteAl3(PO4)2(OH,F)3 · 5H2O2:~3Orthorhombica = 9.621 b = 17.363 c = 6.9941168.32.36Biaxial (+) nα = 1.518 - 1.535 nβ = 1.524 - 1.543 nγ = 1.544 - 1.561 2V: measured: 60° to 72°, calculated: 60° to 70°

Max birefringence: δ = 0.026ZwieseliteFe2+2(PO4)F1:1MonoclinicP21/b753.82Biaxial (+) nα = 1.686 - 1.696 nβ = 1.690 - 1.704 nγ = 1.703 - 1.713 2V: measured: 58° , calculated: 60°

Max birefringence: δ = 0.017Na5-4.5PO4(CO3,F,Cl)1:~1

Artificial nameformulaformula weightcrystal systemspace groupunit cell Åvolumedensityrefractive indexcommentreferenceEMM-9; 4-(dimethylamino)pyridine fluoroaluminophosphate(DMAP)2Al4P4O17F2•H2OmonoclinicP21/aa=14.335 b=13.561 c=14.497 β =101.094°layeredKBPO4FmonoclinicCcIron-Doped Sodium–Vanadium FluorophosphateNa3V2–yO2–yFey(PO4)2F1+y (y < 0.3)tetrahedralP42/mnma=9.0277 c=10.6259866.0Na3V2O1.6(PO4)2F1.4Na3V2(PO4)2F3Na2MnPO4F(N2H5)Fe3(PO4)F6orthorhombicImmaa = 7.3527 b = 12.7814 c = 10.764αNa2FePO4FmonoclinicP21/ca = 13.675, b = 5.2503, c = 13.7202, β = 120.230°βNa2FePO4ForthorhombicRbBPO4F210.25cubicP213a=7.5901 Z=4437.263.194colourlessMIL-145RbGa3(PO4)2(HPO4)F4·C5N2H16·2H2O3187.11monoclinicP2a=14.4314 b=9.1152 c=16.7889 β = 112.708 Z=12037.302.598colourlessK2SnPO4F3348.86monoclinicP21/ca=10.039 b=9.415 c=21.602 beta=95.464 Z=122032.63.420colourlessK6Sn(P2O7)2F2739.17monoclinicP21/ca=8.515 b=12.400 c=8.403 beta=99.58 Z=29874.82.806colourlessK2Sb(P2O7)FtetragonalP4bma=8.5239 c=5.572 Z=2404.83.223colourless SHG 4.0×KDPCsBPO4FcubicP213a=7.7090 Z=4458.143.736colourlessNa2PrF2(PO4)cubicNa2NdF2(PO4)cubicNa2SmF2(PO4)cubicNa2EuF2(PO4)cubicNa2TbF2(PO4)cubicNa2PrF2(PO4)cubicSr4Gd3Na3(PO4)6F2PbZn(PO4)F386.53orthorhombicPna21a=8.985 b=9.381 c=4.8212 Z=4406.46.318colourless

References