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Fluorbritholite-(Y)
A valid IMA mineral species
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About Fluorbritholite-(Y)
Formula:
(Y,Ca)5(SiO4)3F
Colour:
Light pinkish-brown to brownish-pink; light brown; dark brown
Lustre:
Vitreous, Resinous, Greasy
Hardness:
5½
Specific Gravity:
4.609 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named according to the nomenclature for the apatite supergroup (Pasero et al 2010). The name denotes its fluorine content, relationship to other britholite group minerals, and its yttrium content. The britholite root/group name is from the Greek βρῖθος (brithos) for weight, referring to the mineral's high specific gravity.
Co-Type Localities:
Isostructural with:
A mineral in the Britholite Group of the Apatite Supergroup. The fluorine-dominant analogue of britholite-(Y). It is isostructural with fluorapatite.
Unique Identifiers
Mindat ID:
39556
Long-form identifier:
mindat:1:1:39556:0
Similar Names
| Fluorbritholite | ||
| Fluorbritholite-(Ce) | A valid IMA mineral species | (Ce,Ca)5(SiO4)3F |
| Fluorbritholite-(La) | A valid IMA mineral species - pending publication | Ca2La3(SiO4)3F |
| Fluorbritholite-(Nd) | A valid IMA mineral species | Ca2Nd3(SiO4)3F |
IMA Classification of Fluorbritholite-(Y)
Approved
Approval year:
2009
First published:
2011
Type description reference:
Pekov, Igor V., Zubkova, Natalia V., Chukanov, Nikita V., Husdal, Tomas A., Zadov, Aleksandr E., Pushcharovsky, Dmitry Yu. (2011) Fluorbritholite-(Y), (Y,Ca,Ln)5[(Si,P)O4]3 F, a new mineral of the britholite group. Neues Jahrbuch für Mineralogie - Abhandlungen, 188 (2) 191-197 doi:10.1127/0077-7757/2011/0200
Classification of Fluorbritholite-(Y)
9.AH.25
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
52.4.12.8
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
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 |
|---|---|---|
| Fbri-Y | 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 Fluorbritholite-(Y)
Vitreous, Resinous, Greasy
Transparency:
Transparent
Comment:
intermediate between typically vitreous and typically greasy, metamict samples show resinous lustre.
Colour:
Light pinkish-brown to brownish-pink; light brown; dark brown
Streak:
Pale brownish to almost white.
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal
Density:
4.609 g/cm3 (Calculated)
Comment:
Not measured due to numerous micro-inclusions of fluorite and bastnäsite-(Ce).
Optical Data of Fluorbritholite-(Y)
Type:
Uniaxial (+)
RI values:
nω = 1.784(2) nε = 1.789(3)
Max. Birefringence:
δ = 0.005
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:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Fluorbritholite-(Y)
Mindat Formula:
(Y,Ca)5(SiO4)3F
Element Weights:
Crystallography of Fluorbritholite-(Y)
Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Setting:
P63/m
Cell Parameters:
a = 9.4437(2) Å, c = 6.8192(2) Å
Ratio:
a:c = 1 : 0.722
Unit Cell V:
526.68 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Irregular grains; hexagonal, tabular crystals; short-prismatic to thick-tabular crystals.
Forms: pinacoid {0001} and hexagonal prism {10-10} or {11-20}.
Forms: pinacoid {0001} and hexagonal prism {10-10} or {11-20}.
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) |
|---|---|---|---|---|---|---|---|
| 0018905 | Fluorbritholite-(Y) | Pekov I V, Zubkova N V, Chukanov N V, Husdal T A, Zadov A E, Pushcharovsky D Y (2011) Fluorbritholite-(Y), (Y,Ca,Ln)5[(Si,P)O4]3F, a new mineral of the britholite group Neues Jahrbuch fur Mineralogie, Abhandlungen 188 191-197 | 2011 | Lagmannsvik, Hamaroy, Nordland, Norway | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.104 Å | (27) |
| 3.160 Å | (27) |
| 3.102 Å | (29) |
| 2.826 Å | (100) |
| 2.775 Å | (58) |
| 2.737 Å | (46) |
| 1.948 Å | (25) |
| 1.839 Å | (28) |
Reference:
Pekov, Igor V., Zubkova, Natalia V., Chukanov, Nikita V., Husdal, Tomas A., Zadov, Aleksandr E., Pushcharovsky, Dmitry Yu. (2011) Fluorbritholite-(Y), (Y,Ca,Ln)5[(Si,P)O4]3 F, a new mineral of the britholite group. Neues Jahrbuch für Mineralogie - Abhandlungen, 188 (2) 191-197 doi:10.1127/0077-7757/2011/0200
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 Fluorbritholite-(Y)
Co-Type Localities:
General Appearance of Type Material:
Lagmannsvik: As irregular grains and coarse, hexagonal, tabular crystals.
up to 1 mm embedded in granular aggregates of of creamcolored Y-rich fluorite “yttrofluorite”) and allanite-(Ce).
up to 1 mm embedded in granular aggregates of of creamcolored Y-rich fluorite “yttrofluorite”) and allanite-(Ce).
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow
Geological Setting of Type Material:
Alkaline-granite-related pegmatites (Lagmannsvik and Kråkmo); Amazonite-bearing pegmatite vein (Mt. Vyuntspakhk)
Associated Minerals at Type Locality:
Reference:
Pekov, Igor V., Zubkova, Natalia V., Chukanov, Nikita V., Husdal, Tomas A., Zadov, Aleksandr E., Pushcharovsky, Dmitry Yu. (2011) Fluorbritholite-(Y), (Y,Ca,Ln)5[(Si,P)O4]3 F, a new mineral of the britholite group. Neues Jahrbuch für Mineralogie - Abhandlungen, 188 (2) 191-197 doi:10.1127/0077-7757/2011/0200
Synonyms of Fluorbritholite-(Y)
Other Language Names for Fluorbritholite-(Y)
Dutch:Fluorbritholiet-(Y)
German:Fluorbritholith-(Y)
Relationship of Fluorbritholite-(Y) to other Species
Member of:
Other Members of Britholite Group:
| Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH | Hex. 6/m : P63/m |
| 'Britholite-(La)' | Ca2(La,Ce,Ca)3(SiO4,PO4)3(OH,F) | |
| Britholite-(Y) | (Y,Ca)5(SiO4)3OH | Hex. 6/m : P63/m |
| 'Calciobritholite' | (Ca,Y)5(SiO4,PO4)3(OH) | |
| Fluorbritholite-(Ce) | (Ce,Ca)5(SiO4)3F | Hex. 6/m : P63/m |
| Fluorbritholite-(La) | Ca2La3(SiO4)3F | Hex. 6/m : P63/m |
| Fluorbritholite-(Nd) | Ca2Nd3(SiO4)3F | Hex. 6/m : P63/m |
| Fluorcalciobritholite | (Ca,REE)5(SiO4,PO4)3F | Hex. 6/m : P63/m |
| Tritomite-(Ce) | Ce5(SiO4,BO4)3(OH,O) | |
| Tritomite-(Y) | Y5(SiO4,BO4)3(O,OH,F) |
Common Associates
Associations Based on Photo Data:
| 5 photos of Fluorbritholite-(Y) associated with Bastnäsite-(Ce) | Ce(CO3)F |
| 1 photo of Fluorbritholite-(Y) associated with Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 |
| 1 photo of Fluorbritholite-(Y) associated with Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 1 photo of Fluorbritholite-(Y) associated with 'Yttrofluorite' | (Ca1-xYx)F2+x where 0.05 < x < 0.3 |
Related Minerals - Strunz-mindat Grouping
| 9.AH. | Fluorbritholite-(Nd) | Ca2Nd3(SiO4)3F |
| 9.AH.05 | Iimoriite-(Y) | Y2[SiO4][CO3] |
| 9.AH.10 | Tundrite-(Ce) | Na2Ce2Ti(SiO4)(CO3)2O2 |
| 9.AH.10 | Tundrite-(Nd) | Na2(Nd,Ce)2Ti(SiO4)(CO3)2O2 |
| 9.AH.15 | Galuskinite | Ca7(SiO4)3(CO3) |
| 9.AH.15 | Spurrite | Ca5(SiO4)2(CO3) |
| 9.AH.20 | Ternesite | Ca5(SiO4)2(SO4) |
| 9.AH.20 | Silicocarnotite | Ca5[(SiO4)(PO4)](PO4) |
| 9.AH.25 | Britholite-(Ce) | (Ce,Ca)5(SiO4)3OH |
| 9.AH.25 | Britholite-(Y) | (Y,Ca)5(SiO4)3OH |
| 9.AH.25 | Mattheddleite | Pb5(SiO4)1.5(SO4)1.5(Cl,OH) |
| 9.AH.25 | Fluorbritholite-(Ce) | (Ce,Ca)5(SiO4)3F |
| 9.AH.25 | Fluorellestadite | Ca5(SiO4)1.5(SO4)1.5F |
| 9.AH.25 | Fluorbritholite-(La) | Ca2La3(SiO4)3F |
| 9.AH.25 | Hydroxylellestadite | Ca5(SiO4)1.5(SO4)1.5(OH) |
| 9.AH.25 | 'Calciobritholite' | (Ca,Y)5(SiO4,PO4)3(OH) |
| 9.AH.25 | 'Britholite-(La)' | Ca2(La,Ce,Ca)3(SiO4,PO4)3(OH,F) |
| 9.AH.25 | Tritomite-(Ce) | Ce5(SiO4,BO4)3(OH,O) |
| 9.AH.25 | Tritomite-(Y) | Y5(SiO4,BO4)3(O,OH,F) |
| 9.AH.25 | Fluorcalciobritholite | (Ca,REE)5(SiO4,PO4)3F |
| 9.AH.25 | Chlorellestadite | Ca5(SiO4)1.5(SO4)1.5Cl |
| 9.AH.35 | Dargaite | BaCa12(SiO4)4(SO4)2O3 |
| 9.AH.35 | Nabimusaite | KCa12(SiO4)4(SO4)2O2F |
| 9.AH.40 | Stracherite | BaCa6(SiO4)2[(PO4)(CO3)]F |
| 9.AH.40 | Zadovite | BaCa6[(SiO4)(PO4)](PO4)2F |
| 9.AH.40 | Gazeevite | BaCa6(SiO4)2(SO4)2O |
| 9.AH.45 | Flamite | Ca8-x(Na,K)x(SiO4)4-x(PO4)x |
| 9.AH.50 | Byzantievite | Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5 |
| 9.AH.55 | Greenwoodite | (Ba,V3+O)2V3+9(Fe3+,Fe2+)2Si2O22 |
| 9.AH.60 | Kihlmanite-(Ce) | Ce2TiO2(SiO4)(HCO3)2(H2O) |
| 9.AH.65 | Tsangpoite | Ca5(PO4)2(SiO4) |
| 9.AH.70 | 'Enalite' | (Th,REE,Al) [(PO4),(SiO4),(OH)] |
Other Information
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 Fluorbritholite-(Y)
mindat.org URL:
https://www.mindat.org/min-39556.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Fluorbritholite-(Y)
Reference List:
Pasero, Marco, Kampf, Anthony R., Ferraris, Cristiano, Pekov, Igor V., Rakovan, John, White, Timothy J. (2010) Nomenclature of the apatite supergroup minerals. European Journal of Mineralogy, 22 (2) 163-179 doi:10.1127/0935-1221/2010/0022-2022
Pekov, Igor V., Zubkova, Natalia V., Chukanov, Nikita V., Husdal, Tomas A., Zadov, Aleksandr E., Pushcharovsky, Dmitry Yu. (2011) Fluorbritholite-(Y), (Y,Ca,Ln)5[(Si,P)O4]3 F, a new mineral of the britholite group. Neues Jahrbuch für Mineralogie - Abhandlungen, 188 (2) 191-197 doi:10.1127/0077-7757/2011/0200
Localities for Fluorbritholite-(Y)
Showing 11 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.
Canada | |
| Matte et al. (2025) |
Finland | |
| Pavel M. Kartashov analytical data 2019 |
Norway | |
| Griffin et al. (1979) +2 other references |
| Pekov et al. (2011) |
| Pekov et al. (2011) |
Russia | |
| Zozulya et al. (2015) |
| Pekov et al. (2011) |
Slovakia | |
| Uher et al. (2015) |
Sweden | |
| Andersson et al. (2024) |
| Holtstam et al. (2007) |
| Holtstam et al. (2007) |
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Vyuntspakhk Mt, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia