Nefedovite
A valid IMA mineral species
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About Nefedovite
Dr. Evgeniy Ivanovich Nefedov
Formula:
Na5Ca4(PO4)4F
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
3.01
Crystal System:
Triclinic
Name:
Named in honor of Dr. Yevgenii Ivanovich Nefedov (Евгений Иванович Нефедов) (1910–1976), Russian mineralogist, St. Petersburg, Russia, involved in the discovery of a number of Kola minerals.
This page provides mineralogical data about Nefedovite.
Unique Identifiers
Mindat ID:
2870
Long-form identifier:
mindat:1:1:2870:3
IMA Classification of Nefedovite
Approved
Approval year:
1982
First published:
1983
Classification of Nefedovite
8.BO.30
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
41.11.4.1
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : Miscellaneous
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : Miscellaneous
22.1.7
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Nef | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Nefedovite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
4½ on Mohs scale
Fracture:
Conchoidal
Density:
3.01 g/cm3 (Measured) 3.05(1) g/cm3 (Calculated)
Optical Data of Nefedovite
Type:
Biaxial (+)
RI values:
nα = 1.571(2) nβ = 1.571(2) nγ = 1.590(2)
Max. Birefringence:
δ = 0.019
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r < v
Chemistry of Nefedovite
Mindat Formula:
Na5Ca4(PO4)4F
Element Weights:
Crystallography of Nefedovite
Crystal System:
Triclinic
Cell Parameters:
a = 5.401(6) Å, b = 11.647(8) Å, c = 16.484(7) Å
α = 134.99°, β = 90.04°, γ = 89.96°
α = 134.99°, β = 90.04°, γ = 89.96°
Ratio:
a:b:c = 0.464 : 1 : 1.415
Unit Cell V:
733.35 ų (Calculated from Unit Cell)
Z:
2
Comment:
space group P1 or P1
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012476 | Nefedovite | Sebals M, Dorokhova G I, Pobedimskaya E A, Khomyakov A P (1984) The crystal structure of nefedovite and its typomorphism Doklady Akademii Nauk SSSR 278 353-357 | 1984 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.73 Å | (80b) |
| 2.772 Å | (100) |
| 2.703 Å | (70) |
| 2.508 Å | (80) |
| 2.290 Å | (80) |
| 1.877 Å | (60) |
| 5.83 Å | (40) |
| 2.141 Å | (40) |
| 1.983 Å | (35) |
| 1.807 Å | (35) |
| 1.574 Å | (35) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Nefedovite
Co-Type Localities:
General Appearance of Type Material:
As irregular rounded grains, to 1 mm, in aggregates, typically replacing apatite.
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, Russia, 1302/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82759.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82759.
Associated Minerals at Type Locality:
Synonyms of Nefedovite
Other Language Names for Nefedovite
Common Associates
Associations Based on Photo Data:
| 6 photos of Nefedovite associated with Villiaumite | NaF |
| 1 photo of Nefedovite associated with Eudialyte Group | [N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2) |
| 1 photo of Nefedovite associated with Nacaphite | Na2Ca(PO4)F |
Related Minerals - Strunz-mindat Grouping
| 8.BO. | Ariegilatite | BaCa12(SiO4)4(PO4)2F2O |
| 8.BO. | Aravaite | Ba2Ca18(SiO4)6(PO4)3(CO3)F3O |
| 8.BO. | Theuerdankite | Ag3AsO4 |
| 8.BO.05 | Nacaphite | Na2Ca(PO4)F |
| 8.BO.10 | Petitjeanite | Bi3(PO4)2O(OH) |
| 8.BO.10 | Schumacherite | Bi3(VO4)2O(OH) |
| 8.BO.10 | Preisingerite | Bi3(AsO4)2O(OH) |
| 8.BO.15 | Hechtsbergite | Bi2(VO4)O(OH) |
| 8.BO.15 | Smrkovecite | Bi2(PO4)O(OH) |
| 8.BO.15 | Atelestite | Bi2(AsO4)O(OH) |
| 8.BO.20 | Sahlinite | Pb14(AsO4)2O9Cl4 |
| 8.BO.20 | Kombatite | Pb14(VO4)2O9Cl4 |
| 8.BO.25 | Heneuite | CaMg5(CO3)(PO4)3(OH) |
| 8.BO.35 | Kuznetsovite | [Hg2]2+Hg2+[AsO4]Cl |
| 8.BO.40 | Artsmithite | [Hg2]2+2Al(PO4)1.74(OH)1.78 |
| 8.BO.45 | Schlegelite | Bi7(AsO4)3(MoO4)2O4 |
| 8.BO.50 | Hereroite | [Pb32(O,◻)21](AsO4)2[(Si,As,V,Mo)O4]2Cl10 |
| 8.BO.50 | Erikjonssonite | (Pb32O21)[(V,Si,Mo,As)O4]4Cl9 |
| 8.BO.55 | Rudabányaite | (Ag2Hg2)(AsO4)Cl |
| 8.BO.60 | Segerstromite | Ca3(As5+O4)2[As3+(OH)3]2 |
| 8.BO.65 | Wiklundite | Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6 |
Other Information
Notes:
Insoluble in water, but dissolves readily with no residue at room temperature in 10% HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Nefedovite
mindat.org URL:
https://www.mindat.org/min-2870.html
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References for Nefedovite
Reference List:
Dunn, Pete J., Fleischer, Michael, Francis, Carl A., Langley, Richard H., Kissin, Stephen A., Shigley, Hames E., Vanko, David A., Zilczer, Janet A. (1984) New mineral names. American Mineralogist, 69 (7-8) 810-815
Avdontceva, Margarita S., Shablinskii, Andrey P., Krzhizhanovskaya, Maria G., Krivovichev, Sergey V., Zolotarev, Andrey A., Bocharov, Vladimir N., Vlasenko, Natalia S., Avdontseva, Evgenia Yu., Yakovenchuk, Victor N. (2024) Nefedovite, Na5Ca4(PO4)4F: thermal evolution, phase transition and crystal structure refinement. Physics and Chemistry of Minerals, 51 (2). 13 doi:10.1007/s00269-024-01276-7
Localities for Nefedovite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia | |
| Pekov (1998) |
| Sergey Vasiliev of Systematic Mineralogy (dealer) +2 other references |
| Khomyakov et al. (1983) +2 other references |
| Khomyakov et al. (1983) +2 other references |
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Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia