Pekovite
A valid IMA mineral species
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About Pekovite
Formula:
SrB2Si2O8
Colour:
White, colourless
Lustre:
Vitreous
Hardness:
6½ - 7
Specific Gravity:
3.35
Crystal System:
Orthorhombic
Name:
After Russian mineralogist Igor Viktorovich Pekov (born 1967), a well-known expert on the mineralogy of alkaline rocks.
The strontium analogue of Danburite and Maleevite.
The structure has paracelsian topology; as such, the species may alternatively be grouped within "paracelsian group", alongside with danburite, maleevite, maleevite, paracelsian, hurlbutite, and strontiohurlbutite.
The structure has paracelsian topology; as such, the species may alternatively be grouped within "paracelsian group", alongside with danburite, maleevite, maleevite, paracelsian, hurlbutite, and strontiohurlbutite.
Unique Identifiers
Mindat ID:
25700
Long-form identifier:
mindat:1:1:25700:2
GUID
(UUID V4):
(UUID V4):
33571ab0-3647-49f0-8700-9c4f443cf6c1
IMA Classification of Pekovite
Approved
Approval year:
2003
First published:
2004
Type description reference:
Pautov, L. A., Agakhanov, A. A., Sokolova, E., Hawthorne, F. C. (2004) Maleevite, BaB2Si2O8 and pekovite, SrB2Si2O8, new mineral species from the Dara-i-Pioz alkaline massif, Northern Tajikistan: description and crystal structure. The Canadian Mineralogist, 42 (1) 107-119 doi:10.2113/gscanmin.42.1.107
Classification of Pekovite
9.FA.65
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
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 |
---|---|---|
Pko | 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 Pekovite
Vitreous
Transparency:
Transparent
Colour:
White, colourless
Streak:
White
Hardness:
6½ - 7 on Mohs scale
Hardness:
VHN100=953 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.35(2) g/cm3 (Measured) 3.36 g/cm3 (Calculated)
Optical Data of Pekovite
Type:
Biaxial (-)
RI values:
nα = 1.597(2) nβ = 1.627(2) nγ = 1.632(2)
2V:
Measured: -43° (3)
Max Birefringence:
δ = 0.035
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:
Moderate
Dispersion:
Medium, v > r,
Comments:
beta (calc)
Chemistry of Pekovite
Mindat Formula:
SrB2Si2O8
Elements listed:
Crystallography of Pekovite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 8.155(2) Å, b = 7.919(1) Å, c = 8.921(1) Å
Ratio:
a:b:c = 1.03 : 1 : 1.127
Unit Cell V:
576.11 ų (Calculated from Unit Cell)
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) |
---|---|---|---|---|---|---|---|
0005929 | Pekovite | Pautov L A, Agakhanov A A, Sokolova E V, Hawthorne F C (2004) Maleevite, BaB2Si2O8, and pekovite, SrB2Si2O8, new mineral species from the Dara-i-Pioz alkaline massif, Northern Tajikistan: Description and crystal structure The Canadian Mineralogist 42 107-119 | 2004 | Dara-i-Pioz alkaline massif, Northern Tajikistan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.62 Å | (100) |
3.51 Å | (90) |
2.786 Å | (90) |
3.31 Å | (80) |
1.982 Å | (70B) |
5.94 Å | (60) |
3.01 Å | (60) |
Comments:
Pautov et al. (2004); type material.
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 Pekovite
General Appearance of Type Material:
Anhedral equant grains from 0.05 to 0.2 mm, commonly intergrown with pectolite, quartz, highly strontian fluorite and aegirine .
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Russian Academy of Science, Moscow, Russia.
Associated Minerals at Type Locality:
Reference:
Pautov, L.A., Agakhanov, A.A., Sokolova, E., Hawthorne, F.C. (2004) Maleevite, BaB2Si2O8, and pekovite, SrB2Si2O8, new mineral species from the Dara-I-Pioz Alkaline Massif, northern Tajikistan: description and crystal structure. The Canadian Mineralogist: 42: 107-119.
Synonyms of Pekovite
Other Language Names for Pekovite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.FA. | Hexacelsian | BaAl2Si2O8 |
9.FA. | Wodegongjieite | KCa3(Al7Si9)O32 |
9.FA.05 | Kaliophilite | KAlSiO4 |
9.FA.05 | Kalsilite | KAlSiO4 |
9.FA.05 | Nepheline | Na3K(Al4Si4O16) |
9.FA.05 | Panunzite | (K,Na)AlSiO4 |
9.FA.05 | Trikalsilite | K2NaAl3(SiO4)3 |
9.FA.05 | Yoshiokaite | (Ca,Na)[Al(Al,Si)O4] |
9.FA.05 | Carnegieite | NaAlSiO4 |
9.FA.05 va | Germanate-nepheline | (Na,K)AlGeO4 |
9.FA.05 | Megakalsilite | KAlSiO4 |
9.FA.05 | Trinepheline | NaAlSiO4 |
9.FA.05 | Davidsmithite | (Ca,◻)2Na6Al8Si8O32 |
9.FA.10 | Malinkoite | NaBSiO4 |
9.FA.15 | Virgilite | LiAlSi2O6 |
9.FA.25 | Lisitsynite | KBSi2O6 |
9.FA.30 | Buddingtonite | (NH4)(AlSi3O8) |
9.FA.30 | Celsian | Ba(Al2Si2O8) |
9.FA.30 | Microcline | K(AlSi3O8) |
9.FA.30 | Orthoclase | K(AlSi3O8) |
9.FA.30 | Sanidine | K(AlSi3O8) |
9.FA.30 | Rubicline | Rb(AlSi3O8) |
9.FA.30 va | Germanate-celsian | BaAl2Ge2O8 |
9.FA.30 | Monalbite | NaAlSi3O8 |
9.FA.30 | Ferrisanidine | K[Fe3+Si3O8] |
9.FA.35 | Albite | Na(AlSi3O8) |
9.FA.35 | Anorthite | Ca(Al2Si2O8) |
9.FA.35 | Reedmergnerite | NaBSi3O8 |
9.FA.40 | Paracelsian | Ba(Al2Si2O8) |
9.FA.45 | Svyatoslavite | Ca(Al2Si2O8) |
9.FA.45 | Kumdykolite | Na(AlSi3O8) |
9.FA.50 | Slawsonite | Sr(Al2Si2O8) |
9.FA.55 | Lisetite | CaNa2Al4Si4O16 |
9.FA.60 | Banalsite | Na2BaAl4Si4O16 |
9.FA.60 | Stronalsite | Na2SrAl4Si4O16 |
9.FA.65 | Danburite | CaB2Si2O8 |
9.FA.65 | Maleevite | BaB2Si2O8 |
9.FA.70 | Stöfflerite | CaAl2Si2O8 |
9.FA.70 | Lingunite | (Na,Ca)AlSi3O8 |
9.FA.70 | Liebermannite | KAlSi3O8 |
9.FA.75 | Kokchetavite | K(AlSi3O8) |
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 Pekovite
mindat.org URL:
https://www.mindat.org/min-25700.html
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References for Pekovite
Reference List:
Pautov, L. A., Agakhanov, A. A., Sokolova, E., Hawthorne, F. C. (2004) Maleevite, BaB2Si2O8 and pekovite, SrB2Si2O8, new mineral species from the Dara-i-Pioz alkaline massif, Northern Tajikistan: description and crystal structure. The Canadian Mineralogist, 42 (1) 107-119 doi:10.2113/gscanmin.42.1.107
Mandarino, Joseph A. (2004) New minerals. The Canadian Mineralogist, 42 (6) 1901-1927 doi:10.2113/gscanmin.42.6.1901
Pautov, L. A., Agakhanov, A. A., Sokolova, E., Hawthorne, F. C. (2004) Maleevite, BaB2Si2O8 and pekovite, SrB2Si2O8, new mineral species from the Dara-i-Pioz alkaline massif, Northern Tajikistan: description and crystal structure. The Canadian Mineralogist, 42 (1) 107-119 doi:10.2113/gscanmin.42.1.107
Localities for Pekovite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Quick NavTopAbout PekoviteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan