Fluoride phosphate
{{short description|Class of chemical compounds}}
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
class="wikitable"
!name !formula !ratio PO4:F !formula weight !crystal system !space group !unit cell !volume !density !refractive index !comment !reference |
Althausite
|Mg4(PO4)2(OH,O)(F,☐) |2:~1 | |Orthorhombic |Pnma |a = 8.258 b = 6.054, c = 14.383 |719.06 |2.97 |Biaxial (+) nα = 1.588 nβ = 1.592 nγ = 1.598 2V: measured: 70° , calculated: 80° Max birefringence: δ = 0.010 | |
Amblygonite
|LiAl(PO4)F |1:1 | |Triclinic |P{{overbar|1}} |a = 6.644 b = 7.744 c = 6.91 α = 90.35°, β = 117.33°, γ = 91.01° Z=4 |315.75 |3.04-3.11 |Biaxial (-) nα = 1.577 - 1.591 nβ = 1.592 - 1.605 nγ = 1.596 - 1.613 2V: Measured: 107° to 129.5° Birefringence: 0.020 | |
aravaite
|Ba2Ca18(SiO4)6(PO4)3(CO3)F3O |3:3 | |trigonal |R{{overbar|3}}m |a = 7.1255, c = 66.290 Z=3 |2914.8 | | | |
Arctite
|Na2Ca4(PO4)3F |3:1 | |Trigonal |R{{overbar|3}}m |a = 7.078 c = 41.203 Z=6 |1,787.64 |3.13 |Uniaxial (-) nω = 1.578 nε = 1.577 Birefringence: 0.001 | |
Ariegilatite
|BaCa12(SiO4)4(PO4)2F2O | | |Trigonal |R{{overbar|3}}m |a = 7.1551 c = 41.303 |1381.2 | |Uniaxial (-) nω = 1.650 nε = 1.647 Max Birefringence: δ = 0.003 | |
Babefphite
|BaBePO4(F,OH) |1:~1 | |Tetragonal | | | | |Uniaxial (+) nω = 1.629 nε = 1.632 Max birefringence: δ = 0.003 | |
Belovite-(Ce)
|NaCeSr3(PO4)3F |3:1 | |Trigonal |P{{overbar|3}} |a = 9.692 c = 7.201 |585.80 |4.19 |Uniaxial (-) nω = 1.653 - 1.660 nε = 1.634 - 1.640 Birefringence: 0.015 | |
Belovite-(La)
|NaLaSr3(PO4)3F |3:1 | |Trigonal |P{{overbar|3}} |a = 9.647 c = 7.17 |577.88 |4.19 |Uniaxial (-) nω = 1.653 nε = 1.635 - 1.636 Max birefringence: δ = 0.018 | |
Bøggildite
|Na2Sr2Al2PO4F9 |1:9 | |Monoclinic | | | | |Biaxial (+) nα = 1.462 nβ = 1.466 nγ = 1.469 2V: 80° Max birefringence:δ = 0.007 | |
Carlgieseckeite-(Nd)
|NaNdCa3(PO4)3F | | |Trigonal |P{{overbar|3}} |a = 9.4553 c = 6.9825 |540.62 |3.91 | | |
Cloncurryite
|Cu0.5(VO)0.5Al2(PO4)2F2 · 5H2O |2:2 | |Monoclinic |P21/b |a = 4.9573 b = 12.1824 c = 18.9749 β = 90.933° Z=4 |1145.78 |2.525 |Biaxial (-) nα = 1.548(2) nγ = 1.550(2) 2V: calculated: 56° Max brefringence: δ = 0.002 | |
Deloneite
|(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5 | | |Trigonal |P3 |a = 9.51 c = 7.01 Z=2 |549.05 |3.92 |Uniaxial (-) nω = 1.682 nε = 1.660 Max birefringence: δ = 0.022 | |
Fluellite
|Al2(PO4)F2(OH) · 7H2O | | |Orthorhombic |Fddd |a = 11.22 b = 21.15 c = 8.54 |2,027 |2.139 - 2.17 |Biaxial (+) nα = 1.473 - 1.490 nβ = 1.490 - 1.496 nγ = 1.506 - 1.511 Max birefringence: δ = 0.033 | |
Fluorapatite
|Ca5(PO4)3F |3:1 | |Hexagonal |P63/m |a = 9.3973 c = 6.8782 |526.03 |3.1-3.25 |Uniaxial (-) nω = 1.631 - 1.650 nε = 1.627 - 1.646 Birefringence: 0.004 | |
Fluorcaphite
|SrCaCa3(PO4)3F |3:1 | |Hexagonal |P63/m |a = 9.485 c = 7.000 Z=2 |545.39 | |Uniaxial (-) nω = 1.649 nε = 1.637 Max birefringence: δ = 0.012 | |
Fluorphosphohedyphane
|Ca2Pb3(PO4)3F |3:1 | |Hexagonal |P63/m |a = 9.640, c = 7.012 Z=2 |564.4 |5.445 |Uniaxial (-) nω = 1.836 nε = 1.824 Max birefringence: δ = 0.012 | |
Fluorstrophite
|SrCaSr3(PO4)3F |3:1 | |Hexagonal |P63/m |a = 9.565 c = 7.115 Z=2 |563.74 | |Uniaxial (-) nω = 1.651 nε = 1.637 Max birefringence: δ = 0.014 | |
Francolite
| | | | | | | | | | | |
Herderite
|CaBe(PO4)F | | |Monoclinic | |a = 4.81, b = 7.7 c = 9.82 β = 90.1° |363.7 |3.02 |Biaxial (-) nα = 1.556 - 1.592 nβ = 1.578 - 1.610 nγ = 1.589 - 1.620 2V: calculated: 70° Max birefringence: δ = 0.033 | |
Iangreyite
|Ca2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2O |4:~15 | |Trigonal |P3 2 1 |a = 6.988 c = 16.707 |706.5 | | | |
Isokite
|CaMg(PO4)F | | |Monoclinic |B2/b |a = 6.52 b = 8.75 c = 7.51 β = 121.47° |365.4 |3.15-3.27 |Biaxial (+) nα = 1.590 nβ = 1.595 nγ = 1.615 2V: ,easured: 51° Max birefringence: δ = 0.025 | |
Kingite
|Al3(PO4)2F2(OH) · 7H2O |2:2 | |Triclinic | |a = 9.15 b = 10 c = 7.24 α = 98.6°, β = 93.6°, γ = 93.2° | | |Biaxial | |
Kuannersuite-(Ce)
|NaCeBa3(PO4)3F0.5Cl0.5 |6:1 | |Trigonal |P{{overbar|3}} |a = 9.909 c = 7.402 |629.42 |4.51 | | |
Lacroixite
|NaAl(PO4)F |1:1 | |Monoclinic |B2/b |a = 6.414 b = 8.207 c = 6.885 β = 115.47° |327.20 |3.126 - 3.29 |Biaxial (-) nα = 1.546 nβ = 1.563 nγ = 1.580 2V: measured: 89° Birefringence: 0.034 | |
Mcauslanite
|Fe3Al2(PO4)3(PO3OH)F · 18H2O |4:1 | |Triclinic | |a = 10.05 b = 11.56 c = 6.88 α = 105.84°, β = 93.66°, γ = 106.47° |728.7 | |Biaxial (-) nα = 1.522 nβ = 1.531 nγ = 1.534 2V: measured: 55° to 59.7°, calculated: 58° Max birefringence:δ = 0.012 | |
Minyulite
|KAl2(PO4)2(OH,F) · 4H2O |2:~1 | |Orthorhombic |Pba2 |a = 9.34 b = 9.74 c = 5.52 |502 |2.47 |Biaxial (+) nα = 1.531 nβ = 1.534 nγ = 1.538 2V: measured: 70° , calculated: 82° Max birefringence: δ = 0.007 | |
Miyahisaite
|(Sr,Ca)2Ba3(PO4)3F |3:1 | |Hexagonal |P63/m |a = 9.921, c = 7.469 Z=2 |636.7 |4.511 | | |
Morinite
|NaCa2Al2(PO4)2(OH)F4 · 2H2O |2:4 | |Monoclinic | | | |2.94 |Biaxial (-) nα = 1.551 nβ = 1.563 nγ = 1.565 2V: measured: 43° , calculated: 44° Max birefringence: δ = 0.014 | |
Nacaphite
|Na2Ca(PO4)F | | |Monoclinic |P21/b |a = 13.318 b = 7.0964 c = 10.6490 β = 113.526° Z=8 |922.81 | |Biaxial (-) nα = 1.508 nβ = 1.515 nγ = 1.520 2V: 80° Max birefringence: δ = 0.012 | |
natrophosphate
|Na7(PO4)2F.19H2O |2:1 | |Isometric |Fd3c |a = 27.79 Z=56 |21,461.78 |1,71-1.72 |Isotropic | |{{cite journal|last1=Mitchell|first1=R. H.|date=5 July 2018|title=An ephemeral pentasodium phosphate carbonate from natrocarbonatite lapilli, Oldoinyo Lengai, Tanzania|journal=Mineralogical Magazine|volume=70|issue=2|pages=211–218|doi=10.1180/0026461067020326|s2cid=140140550}}{{Cite web|title=Natrophosphate: Mineral information, data and localities.|url=https://www.mindat.org/min-2862.html|access-date=2020-06-03|website=www.mindat.org}} |
Nefedovite
|Na5Ca4(PO4)4F |4:1 | |Triclinic | |a = 5.4 Å, b = 11.64 Å, c = 16.48 Å α = 134.99°, β = 90.04°, γ = 89.96° |732.60 | |Biaxial (+) nα = 1.571 nγ = 1.590 Max birefringence: δ = 0.019 | |
Nevadaite
|(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O |8:8 | |Orthorhombic |P21mn |a = 12.123 b = 18.999 c = 4.961 | |2.54 |Biaxial (-) nα = 1.540 nβ = 1.548 nγ = 1.553 2V: measured: 76°, calculated: 76° Max birefringence: δ = 0.013 | |
Panasqueiraite
|CaMg(PO4)(OH,F) |1:~1 | |monoclinic | |a = 6.53 b = 8.75 c = 6.91 β = 112.33° |365.2 |3.27 |Biaxial (+) nα = 1.590 nβ = 1.596 nγ = 1.616 2V: measured: 51° , calculated: 58° Max birefringence: δ = 0.026 | |
Richellite
|CaFe3+2(PO4)2(OH,F)2 |2:~2 | | | |a = 5.18 c = 12.61 | | | | |
Stronadelphite
|Sr5(PO4)3F |3:1 | |Hexagonal |P63/m |a = 9.845 c = 7.383 |619.72 | |Uniaxial (-) nω = 1.630(1) nε = 1.623(1) Max birefringence: δ = 0.007 | |
Triplite
|Mn2+2(PO4)F |1:1 | |Monoclinic |P21/b |a = 11.9 b = 6.52 c = 10.09 β = 105.62° |758.4 |3.9 |Biaxial (+) nα = 1.650 nβ = 1.660 nγ = 1.680 2V: measured: 70° to 90°, calculated: 72° Max birefringence: δ = 0.030 | |
Väyrynenite
|Mn2+Be(PO4)(OH,F) |1:~1 | |Monoclinic |P21/b |a = 5.411 b = 14.49 c = 4.73 β = 102.75° |361.71 |3.22 |Biaxial (-) 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 - 0.027 | |
Viitaniemiite
|Na(Ca,Mn2+)Al(PO4)(F,OH)3 |1:~3 | |Monoclinic | |a = 6.83 b = 7.14 c = 5.44 β = 109.37° |250.27 | |Biaxial (-) nα = 1.557 nβ = 1.565 nγ = 1.571 2V: measured: 81° , calculated: 80° Max birefringence: δ = 0.014 | |
Wagnerite
|(Mg,Fe2+)2(PO4)F |1:1 | |Monoclinic |P21/b |a = 9.645 b = 31.659 c = 11.914 β = 108.26(3)° |3454.8 |3.15 |Biaxial (+) nα = 1.568 nβ = 1.572 nγ = 1.582 2V: Measured: 25° to 35° ? Birefringence:0.046 Max birefringence: δ = 0.015 | |
Wavellite
|Al3(PO4)2(OH,F)3 · 5H2O |2:~3 | |Orthorhombic | |a = 9.621 b = 17.363 c = 6.994 |1168.3 |2.36 |Biaxial (+) 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 = 0.026 | |
Zwieselite
|Fe2+2(PO4)F |1:1 | |Monoclinic |P21/b | |753.82 | |Biaxial (+) nα = 1.686 - 1.696 nβ = 1.690 - 1.704 nγ = 1.703 - 1.713 2V: measured: 58° , calculated: 60° Max birefringence: δ = 0.017 | |
|Na5-4.5PO4(CO3,F,Cl)
|1:~1 | | | | | | | | |
Artificial
class="wikitable"
!name !formula !formula weight !crystal system !space group !unit cell Å !volume !density !refractive index !comment !reference |
EMM-9; 4-(dimethylamino)pyridine fluoroaluminophosphate
|(DMAP)2Al4P4O17F2•H2O | |monoclinic |P21/a |a=14.335 b=13.561 c=14.497 β =101.094° | | | |layered |
|KBPO4F
| |monoclinic |Cc | | | | | |
Iron-Doped Sodium–Vanadium Fluorophosphate
|Na3V2–yO2–yFey(PO4)2F1+y (y < 0.3) | |tetrahedral |P42/mnm |a=9.0277 c=10.6259 |866.0 | | | |
|Na3V2O1.6(PO4)2F1.4
| | | | | | | | |
|Na3V2(PO4)2F3
| | | | | | | | |
|Na2MnPO4F
| | | | | | | | |
α
|Na2FePO4F | |monoclinic |P21/c |a = 13.675, b = 5.2503, c = 13.7202, β = 120.230° | | | | |
β
|Na2FePO4F | |orthorhombic | | | | | | |
|RbBPO4F
|210.25 |cubic |P213 |a=7.5901 Z=4 |437.26 |3.194 | |colourless |
MIL-145
|RbGa3(PO4)2(HPO4)F4·C5N2H16·2H2O |3187.11 |monoclinic |P2 |a=14.4314 b=9.1152 c=16.7889 β = 112.708 Z=1 |2037.30 |2.598 | |colourless |
|K2SnPO4F3
|348.86 |monoclinic |P21/c |a=10.039 b=9.415 c=21.602 beta=95.464 Z=12 |2032.6 |3.420 | |colourless |
|K6Sn(P2O7)2F2
|739.17 |monoclinic |P21/c |a=8.515 b=12.400 c=8.403 beta=99.58 Z=29 |874.8 |2.806 | |colourless |
|K2Sb(P2O7)F
| |tetragonal |P4bm |a=8.5239 c=5.572 Z=2 |404.8 |3.223 | |colourless SHG 4.0×KDP |
|CsBPO4F
| |cubic |P213 |a=7.7090 Z=4 |458.14 |3.736 | |colourless |
|Na2PrF2(PO4)
| |cubic | | | | | | |
|Na2NdF2(PO4)
| |cubic | | | | | | |
|Na2SmF2(PO4)
| |cubic | | | | | | |
|Na2EuF2(PO4)
| |cubic | | | | | | |
|Na2TbF2(PO4)
| |cubic | | | | | | |
|Na2PrF2(PO4)
| |cubic | | | | | | |
|PbZn(PO4)F
|386.53 |orthorhombic |Pna21 |a=8.985 b=9.381 c=4.8212 Z=4 |406.4 |6.318 | |colourless |