Fluoride phosphate explained

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

name	formula	ratioPO4: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 = 1.5982V: measured: 70°, calculated: 80° Max birefringence: δ = 0.010		^[1]
Amblygonite	LiAl(PO4)F	1:1		Triclinic	P	a = 6.644 b = 7.744 c = 6.91α = 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 - 1.6132V: Measured: 107° to 129.5° Birefringence: 0.020		^[2]
aravaite	Ba2Ca18(SiO4)6(PO4)3(CO3)F3O	3:3		trigonal	Rm	a = 7.1255, c = 66.290 Z=3	2914.8				^[3]
Arctite	Na2Ca4(PO4)3F	3:1		Trigonal	Rm	a = 7.078 c = 41.203 Z=6	1,787.64	3.13	Uniaxial (-) nω = 1.578 nε = 1.577 Birefringence: 0.001		^[4]
Ariegilatite	BaCa12(SiO4)4(PO4)2F2O			Trigonal	Rm	a = 7.1551 c = 41.303	1381.2		Uniaxial (-) nω = 1.650 nε = 1.647Max Birefringence: δ = 0.003		^[5]
Babefphite	BaBePO4(F,OH)	1:~1		Tetragonal					Uniaxial (+) nω = 1.629 nε = 1.632 Max birefringence: δ = 0.003		^[6]
Belovite-(Ce)	NaCeSr3(PO4)3F	3:1		Trigonal	P	a = 9.692 c = 7.201	585.80	4.19	Uniaxial (-) nω = 1.653 - 1.660 nε = 1.634 - 1.640Birefringence: 0.015		^[7]
Belovite-(La)	NaLaSr3(PO4)3F	3:1		Trigonal	P	a = 9.647 c = 7.17	577.88	4.19	Uniaxial (-) nω = 1.653 nε = 1.635 - 1.636Max birefringence: δ = 0.018		^[8]
Bøggildite	Na2Sr2Al2PO4F9	1:9		Monoclinic					Biaxial (+) nα = 1.462 nβ = 1.466 nγ = 1.4692V: 80° Max birefringence:δ = 0.007		^[9]
Carlgieseckeite-(Nd)	NaNdCa3(PO4)3F			Trigonal	P	a = 9.4553 c = 6.9825	540.62	3.91			^[10]
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		^[11]
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 = 1.660Max birefringence: δ = 0.022		^[12]
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 - 1.511Max birefringence: δ = 0.033		^[13]
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		^[14]
Fluorcaphite	SrCaCa3(PO4)3F	3:1		Hexagonal	P63/m	a = 9.485 c = 7.000 Z=2	545.39		Uniaxial (-) nω = 1.649 nε = 1.637Max birefringence: δ = 0.012		^[15]
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 = 1.824Max birefringence: δ = 0.012		^[16]
Fluorstrophite	SrCaSr3(PO4)3F	3:1		Hexagonal	P63/m	a = 9.565 c = 7.115 Z=2	563.74		Uniaxial (-) nω = 1.651 nε = 1.637Max birefringence: δ = 0.014		^[17]
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 - 1.6202V: calculated: 70° Max birefringence: δ = 0.033		^[18]
Iangreyite	Ca2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2O	4:~15		Trigonal	P3 2 1	a = 6.988 c = 16.707	706.5				^[19]
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 = 1.6152V:,easured: 51° Max birefringence: δ = 0.025		^[20]
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		^[21]
Kuannersuite-(Ce)	NaCeBa3(PO4)3F0.5Cl0.5	6:1		Trigonal	P	a = 9.909 c = 7.402	629.42	4.51			^[22]
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 = 1.5802V: measured: 89° Birefringence: 0.034		^[23]
Mcauslanite	Fe3Al2(PO4)3(PO3OH)F · 18H2O	4:1		Triclinic		a = 10.05 b = 11.56 c = 6.88α = 105.84°, β = 93.66°, γ = 106.47°	728.7		Biaxial (-) nα = 1.522 nβ = 1.531 nγ = 1.5342V: measured: 55° to 59.7°, calculated: 58° Max birefringence:δ = 0.012		^[24]
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 = 1.5382V: measured: 70°, calculated: 82° Max birefringence: δ = 0.007		^[25]
Miyahisaite	(Sr,Ca)2Ba3(PO4)3F	3:1		Hexagonal	P63/m	a = 9.921, c = 7.469 Z=2	636.7	4.511			^[26]
Morinite	NaCa2Al2(PO4)2(OH)F4 · 2H2O	2:4		Monoclinic				2.94	Biaxial (-) nα = 1.551 nβ = 1.563 nγ = 1.5652V: measured: 43°, calculated: 44° Max birefringence: δ = 0.014		^[27]
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 = 1.5202V: 80° Max birefringence: δ = 0.012		^[28]
natrophosphate	Na7(PO4)2F.19H2O	2:1		Isometric	Fd3c	a = 27.79 Z=56	21,461.78	1,71-1.72	Isotropic		^[29] ^[30]
Nefedovite	Na5Ca4(PO4)4F	4:1		Triclinic		a = 5.4 Å, b = 11.64 Å, c = 16.48 Åα = 134.99°, β = 90.04°, γ = 89.96°	732.60		Biaxial (+) nα = 1.571 nγ = 1.590Max birefringence: δ = 0.019		^[31]
Nevadaite	(Cu^2+,Al,V^3+)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 = 1.5532V: measured: 76°, calculated: 76° Max birefringence: δ = 0.013		^[32]
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 = 1.6162V: measured: 51°, calculated: 58° Max birefringence: δ = 0.026		^[33]
Richellite	CaFe^3+2(PO4)2(OH,F)2	2:~2				a = 5.18 c = 12.61					^[34]
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		^[35]
Triplite	Mn^2+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		^[36]
Väyrynenite	Mn^2+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 - 1.6672V: measured: 46° to 55°, Calculated: 51° to 57° Max birefringence: δ = 0.026 - 0.027		^[37]
Viitaniemiite	Na(Ca,Mn^2+)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 = 1.5712V: measured: 81°, calculated: 80° Max birefringence: δ = 0.014		^[38]
Wagnerite	(Mg,Fe^2+)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 = 1.5822V: Measured: 25° to 35° ? Birefringence:0.046 Max birefringence: δ = 0.015		^[39]
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 - 1.5612V: measured: 60° to 72°, calculated: 60° to 70° Max birefringence: δ = 0.026		^[40]
Zwieselite	Fe^2+2(PO4)F	1:1		Monoclinic	P21/b		753.82		Biaxial (+) nα = 1.686 - 1.696 nβ = 1.690 - 1.704 nγ = 1.703 - 1.7132V: measured: 58°, calculated: 60° Max birefringence: δ = 0.017		^[41]
	Na5-4.5PO4(CO3,F,Cl)	1:~1

Artificial

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	^[42]
	KBPO4F		monoclinic	Cc						^[43]
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				^[44]
	Na3V2O1.6(PO4)2F1.4
	Na3V2(PO4)2F3									^[45]
	Na2MnPO4F									^[46]
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	^[47]
	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	^[48]
	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	^[49]
	CsBPO4F		cubic	P213	a=7.7090 Z=4	458.14	3.736		colourless
	Na2PrF2(PO4)		cubic							^[50]
	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	^[51]

Notes and References

1. Web site: Althausite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
2. Web site: Amblygonite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
3. Krüger. Biljana. Krüger. Hannes. Galuskin. Evgeny V.. Galuskina. Irina O.. Vapnik. Yevgeny. Olieric. Vincent. Pauluhn. Anuschka. 2018-12-01. Aravaite, Ba 2 Ca 18 (SiO 4) 6 (PO 4) 3 (CO 3)F 3 O: modular structure and disorder of a new mineral with single and triple antiperovskite layers. Acta Crystallographica Section B. 74. 6. 492–501. 10.1107/S2052520618012271. 2018AcCrB..74..492K . 104301273 . 2052-5206.
4. Web site: Arctite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
5. Web site: Ariegilatite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
6. Web site: Babefphite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
7. Web site: Belovite-(Ce): Mineral information, data and localities.. 2020-06-03. www.mindat.org.
8. Web site: Belovite-(La): Mineral information, data and localities.. 2020-06-03. www.mindat.org.
9. Web site: Bøggildite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
10. Web site: Carlgieseckeite-(Nd): Mineral information, data and localities.. 2020-06-03. www.mindat.org.
11. Web site: Cloncurryite: Mineral information, data and localities.. 2020-06-04. www.mindat.org.
12. Web site: Deloneite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
13. Web site: Fluellite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
14. Web site: Fluorapatite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
15. Web site: Fluorcaphite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
16. Web site: Fluorphosphohedyphane: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
17. Web site: Fluorstrophite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
18. Web site: Herderite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
19. Web site: Iangreyite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
20. Web site: Isokite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
21. Web site: Kingite: Mineral information, data and localities.. 2020-06-04. www.mindat.org.
22. Web site: Kuannersuite-(Ce): Mineral information, data and localities.. 2020-06-03. www.mindat.org.
23. Web site: Lacroixite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
24. Web site: Mcauslanite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
25. Web site: Minyulite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
26. Web site: Miyahisaite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
27. Web site: Morinite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
28. Web site: Nacaphite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
29. Mitchell. R. H.. 5 July 2018. An ephemeral pentasodium phosphate carbonate from natrocarbonatite lapilli, Oldoinyo Lengai, Tanzania. Mineralogical Magazine. 70. 2. 211–218. 10.1180/0026461067020326. 140140550.
30. Web site: Natrophosphate: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
31. Web site: Nefedovite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
32. Web site: Nevadaite: Mineral information, data and localities.. 2020-06-04. www.mindat.org.
33. Web site: Panasqueiraite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
34. Web site: Richellite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
35. Web site: Stronadelphite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
36. Web site: Triplite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
37. Web site: Väyrynenite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
38. Web site: Viitaniemiite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
39. Web site: Wagnerite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
40. Web site: Wavellite: Mineral information, data and localities.. 2020-06-04. www.mindat.org.
41. Web site: Zwieselite: Mineral information, data and localities.. 2020-06-03. www.mindat.org.
42. Guo . Peng . Afeworki . Mobae . Cao . Guang . Yun . Yifeng . Sun . Junliang . Su . Jie . Wan . Wei . Zou . Xiaodong . 2018-09-17 . Synthesis and Structure of a Layered Fluoroaluminophosphate and Its Transformation to a Three-Dimensional Zeotype Framework . Inorganic Chemistry . en . 57 . 18 . 11753–11760 . 10.1021/acs.inorgchem.8b01890 . 0020-1669.
43. Ding . Qingran . Zhao . Sangen . Li . Lina . Shen . Yaoguo . Shan . Pai . Wu . Zhenyue . Li . Xianfeng . Li . Yanqiang . Liu . Shuai . Luo . Junhua . 2019-02-04 . Abrupt Structural Transformation in Asymmetric ABPO 4 F (A = K, Rb, Cs) . Inorganic Chemistry . en . 58 . 3 . 1733–1737 . 10.1021/acs.inorgchem.8b02754 . 0020-1669.
44. Palomares . Verónica . Iturrondobeitia . Amaia . Sanchez-Fontecoba . Paula . Goonetilleke . Damian . Sharma . Neeraj . Lezama . Luis . Rojo . Teófilo . Iron-Doped Sodium–Vanadium Fluorophosphates: Na₃V_2–yO_2–yFe_y(PO₄)₂F_1+y (y < 0.3). Inorganic Chemistry . 16 December 2019 . 59 . 1 . 854–862 . 10.1021/acs.inorgchem.9b03111. 31840984 . 209384135 .
45. Semykina . Daria O. . Sharafutdinov . Marat R. . Kosova . Nina V. . 2022-06-24 . Understanding of the Mechanism and Kinetics of the Fast Solid-State Reaction between NaF and VPO 4 to Form Na 3 V 2 (PO 4) 2 F 3 . Inorganic Chemistry . 61 . 26 . en . 10023–10035 . 10.1021/acs.inorgchem.2c00951 . 35748412 . 249989441 . 0020-1669.
46. Kirsanova. Maria A.. Akmaev. Alexey S.. Aksyonov. Dmitry A.. Ryazantsev. Sergey V.. Nikitina. Victoria A.. Filimonov. Dmitry S.. Avdeev. Maxim. Abakumov. Artem M.. 2020-11-16. Monoclinic α-Na 2 FePO 4 F with Strong Antisite Disorder and Enhanced Na + Diffusion. Inorganic Chemistry. en. 59. 22. 16225–16237. 10.1021/acs.inorgchem.0c01961. 33137251. 226241204 . 0020-1669.
47. Martineau. Charlotte. Loiseau. Thierry. Beitone. Lionel. Férey. Gérard. Bouchevreau. Boris. Taulelle. Francis. 2013. Single-crystal XRD and solid-state NMR structural resolution of a layered fluorinated gallium phosphate: RbGa 3 (PO 4) 2 (HPO 4)F 4 ·C 5 N 2 H 16 ·2H 2 O (MIL-145). Dalton Trans.. en. 42. 2. 422–431. 10.1039/C2DT31464A. 23069866 . 1477-9226.
48. Hu. Shuaishuai. Su. Zhi. 2019. Two new tin(iv)-containing phosphate fluorides with two types of Sn(iv)–P–O–F frameworks and short cutoff edges. New Journal of Chemistry. en. 43. 41. 16127–16130. 10.1039/C9NJ04424H. 203137437 . 1144-0546.
49. Deng. Yalan. Huang. Ling. Dong. Xuehua. Wang. Lei. Ok. Kang Min. Zeng. Hongmei. Lin. Zhien. Zou. Guohong. 2020-11-16. K 2 Sb(P 2 O 7)F: Cairo Pentagonal Layer with Bifunctional Genes Reveal Optical Performance. Angewandte Chemie International Edition. en. 59. 47. 21151–21156. 10.1002/anie.202009441. 32745331 . 250308476 . 1433-7851.
50. Zimina . G. V. . Smirnova . I. N. . Gorkovenko . M. Yu. . Spiridonov . F. M. . Komissarova . L. N. . Kaloev . N. I. . 1995-02-21 . ChemInform Abstract: Synthesis and Studies of Fluorophosphates of Rare Earth Elements Na2LnF2PO4. . ChemInform . en . 26 . 8 . 10.1002/chin.199508015 . 0931-7597.
51. li . xiaobao . Hu . Chun-Li . Kong . Fang . Mao . Jiang-Gao . 2023 . Structure and Optical Property Evolutions in PbM(PO4)X (M = Zn, Sn; X = halogen): SHG Effect and Birefringence . Inorganic Chemistry Frontiers . 10 . 8 . en . 2268–2275 . 10.1039/D3QI00230F . 257419074 . 2052-1553. free .