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Byzantievite

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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.


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Classification of ByzantieviteHide

Approved
Approval Year:
2009
First Published:
2009

Physical Properties of ByzantieviteHide

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 ByzantieviteHide

Type:
Uniaxial (-)
RI values:
nω = 1.940 nε = 1.860(5)
Max Birefringence:
δ = 0.080
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Strong
Comments:
light brown along e to very pale brownish along w;

Chemical Properties of ByzantieviteHide

Formula:
Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4, SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5
IMA Formula:
Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5
Elements listed:

Crystallography of ByzantieviteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.02 (2)
3.95 (2)
3.112 (10)
2.982 (4)
2.908 (2)
2.885 (2)
2.632 (2)
2.127 (2)

Type Occurrence of ByzantieviteHide

Associated Minerals at Type Locality:
Reference:
Sokolova, E., Pautov, L., Agakhanov, A., Hawthorne, F. (2009) Byzantievite, the first silicate-borate-phosphate mineral. Acta Crystallographica: A65: s47-s48.

Synonyms of ByzantieviteHide

Other Language Names for ByzantieviteHide

Bengali:Byzantievite

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ByzantieviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sokolova, E., et al. (2009): Byzantievite, the first Silicate-Borate-Phosphate Mineral. Acta Cryst. A65, s47-s48 (2009) [abstract]
Pautov L.A., Agakhanov A.A., Sokolova E.V., Hawthorne F., Karpenko V.Yu. (2011) Byzantievite, Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O21[(OH),F]43(H2O)1.5, a new mineral. New Data on Minerals 46:5-12

Internet Links for ByzantieviteHide

Localities for ByzantieviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
      • Sokh Valley
        • Upper Khodzhaachkan River
Leonid A. Pautov data
Tajikistan (TL)
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
IMA Approvals - April 2009; Pautov L.A., Agakhanov A.A., Sokolova E.V., Hawthorne F., Karpenko V.Yu. (2011) Byzantievite, Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O21[(OH),F]43(H2O)1.5, a new mineral. New Data on Minerals 46:5-12
Mineral and/or Locality  
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