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
GUID
(UUID V4):
(UUID V4):
d3d4e4c0-547d-4d71-a0f6-eef62e616e22
IMA Classification of Nefedovite
Approved
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 |
|---|---|---|
| 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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v
Chemistry of Nefedovite
Mindat Formula:
Na5Ca4(PO4)4F
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:
Reference:
Khomyakov, A.P., Nechelyustov, G.N., Dorokhova, G.I. (1983) Nefedovite, Na5Ca4(PO4)4F, a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 112(4): 479-483.
Synonyms of Nefedovite
Other Language Names for Nefedovite
Common Associates
Associated Minerals Based on Photo Data:
| 5 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 | Preisingerite | Bi3(AsO4)2O(OH) |
| 8.BO.10 | Petitjeanite | Bi3(PO4)2O(OH) |
| 8.BO.10 | Schumacherite | Bi3(VO4)2O(OH) |
| 8.BO.15 | Atelestite | Bi2(AsO4)O(OH) |
| 8.BO.15 | Hechtsbergite | Bi2(VO4)O(OH) |
| 8.BO.15 | Smrkovecite | Bi2(PO4)O(OH) |
| 8.BO.20 | Kombatite | Pb14(VO4)2O9Cl4 |
| 8.BO.20 | Sahlinite | Pb14(AsO4)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
Localities for Nefedovite
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 | |
| Sergey Vasiliev of Systematic Mineralogy (dealer) +1 other reference |
| Khomyakov et al. (1983) +2 other references |
| Pekov (1998) |
| Khomyakov et al. (1983) +2 other references |
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Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia