Byzantievite
A valid IMA mineral species
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About Byzantievite
Formula:
Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5
Colour:
Brown
Lustre:
Vitreous, Greasy
Hardness:
4½ - 5
Specific Gravity:
4.10
Crystal System:
Trigonal
Name:
The describing authors write, "To reflect the complexity and chemical diversity of the structure of this mineral, we have named it byzantievite. (For) nearly twelve centuries (374–1453), the Byzantine Empire was home to many nations and religions. The structure of the Byzantine Empire was very complex, but nevertheless, this state was well-organized, effective and had a major influence on European and World culture."
This page provides mineralogical data about Byzantievite.
Unique Identifiers
Mindat ID:
37645
Long-form identifier:
mindat:1:1:37645:9
IMA Classification of Byzantievite
Approved
IMA Formula:
Ba5(Ca,REE,Y)22(Ti4+,Nb5+)18(SiO4)4(PO4,SiO4)4(BO3)9O22((OH),F)43(H2O)1.5
Approval year:
2009
First published:
2009
Classification of Byzantievite
9.AH.50
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
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 |
|---|---|---|
| Byz | 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 Byzantievite
Vitreous, Greasy
Transparency:
Transparent
Colour:
Brown
Streak:
Pale yellow
Hardness:
4½ - 5 on Mohs scale
Hardness:
VHN50=486 kg/mm2 - Vickers
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4.10(3) g/cm3 (Measured) 4.25 g/cm3 (Calculated)
Optical Data of Byzantievite
Type:
Uniaxial (-)
RI values:
nω = 1.940 nε = 1.860(5)
Max. Birefringence:
δ = 0.080
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
Pleochroism:
Strong
Comments:
light brown along e to very pale brownish along w;
Chemistry of Byzantievite
Mindat Formula:
Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5
Element Weights:
Crystallography of Byzantievite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
R3
Cell Parameters:
a = 9.1202(2) Å, c = 102.145(5) Å
Ratio:
a:c = 1 : 11.2
Unit Cell V:
7,357.94 ų (Calculated from Unit Cell)
Morphology:
Lamellar and tabular grains flattened parallel on {001} with poorly formed faces reaching 0.5 × 1.8 mm in size.
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) |
|---|---|---|---|---|---|---|---|
| 0014601 | Byzantievite | Sokolova E, Hawthorne F C, Pautov L A, Agakhanov A A (2010) Byzantievite, Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O21[(OH),F]43(H2O)1.5: the crystal structure and crystal chemistry of the only known mineral with the oxyanions (BO3), (SiO4) and (PO4) Mineralogical Magazine 74 285-308 | 2010 | Alai ridge, Tien-Shan Mountains, northern Tajikistan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.02 Å | (2) |
| 3.95 Å | (2) |
| 3.112 Å | (10) |
| 2.982 Å | (4) |
| 2.908 Å | (2) |
| 2.885 Å | (2) |
| 2.632 Å | (2) |
| 2.127 Å | (2) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Byzantievite
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (3791/1).
Associated Minerals at Type Locality:
Synonyms of Byzantievite
Other Language Names for Byzantievite
Common Associates
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 | Fluorbritholite-(Y) | (Y,Ca)5(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.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 Byzantievite
mindat.org URL:
https://www.mindat.org/min-37645.html
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References for Byzantievite
Reference List:
Sokolova, Elena, Pautov, Leonid, Agakhanov, Atali, Hawthorne, Frank (2009) Byzantievite, the first silicate-borate-phosphate mineral. Acta Crystallographica Section A Foundations of Crystallography, 65. 47-48 doi:10.1107/s0108767309099103
Sokolova, E., Hawthorne, F. C., Pautov, L. A., Agakhanov, A. A. (2010) Byzantievite, Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4 (BO3)9O21[(OH),F]43(H2O)1.5: the crystal structure and crystal chemistry of the only known mineral with the oxyanions (BO3), (SiO4) and (PO4) Mineralogical Magazine, 74 (2) 285-308 doi:10.1180/minmag.2010.074.2.285
Localities for Byzantievite
Showing 2 localities.
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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.
Kyrgyzstan | |
| Leonid A. Pautov data |
Tajikistan (TL) | |
| Sokolova et al. (2009) +2 other references |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan