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Pekovite

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About PekoviteHide

01376720014947556602373.jpg
Igor Viktorovich Pekov on the boat on Seidozero lake.
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.


Classification of PekoviteHide

Approved
Approval year:
2003
First published:
2004
9.FA.65

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions

Physical Properties of PekoviteHide

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 PekoviteHide

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.
Surface Relief:
Moderate
Dispersion:
medium, v > r
Comments:
beta (calc)

Chemical Properties of PekoviteHide

Formula:
SrB2Si2O8

Crystallography of PekoviteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005929PekovitePautov 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 42 107-1192004Dara-i-Pioz alkaline massif, Northern Tajikistan0293
CIF Raw Data - click here to close

Type Occurrence of PekoviteHide

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 PekoviteHide

Other Language Names for PekoviteHide

German:Pekovit
Simplified Chinese:硅锶硼石
Traditional Chinese:矽鍶硼石

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Pekovite associated with PectoliteNaCa2Si3O8(OH)
1 photo of Pekovite associated with QuartzSiO2

Related Minerals - Nickel-Strunz GroupingHide

9.FA.05KaliophiliteKAlSiO4Trig. 3 : P3
9.FA.05KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
9.FA.05NephelineNa3K(Al4Si4O16)Hex. 6 : P63
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05TrikalsiliteK2NaAl3(SiO4)3Hex.
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.05MegakalsiliteKAlSiO4Hex. 6 : P63
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
9.FA.25LisitsyniteKBSi2O6Orth. 2 2 2 : P2 2 2
9.FA.30AdulariaKAlSi3O8Mon.
9.FA.30Anorthoclase(Na,K)AlSi3O8Tric.
9.FA.30Buddingtonite(NH4)(AlSi3O8)Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30RubiclineRb(AlSi3O8)Tric.
9.FA.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8Tric.
9.FA.40ParacelsianBa(Al2Si2O8)Mon.
9.FA.45SvyatoslaviteCa(Al2Si2O8)Orth.
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon. 2/m : P21/b
9.FA.55LisetiteCaNa2Al4Si4O16Orth. mm2
9.FA.60BanalsiteNa2BaAl4Si4O16Orth. mm2 : Iba2
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.70Lingunite(Na,Ca)AlSi3O8Tet. 4/m : I4/m
9.FA.75KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc

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 PekoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Mandarino, J.A. (2004) New minerals. The Canadian Mineralogist: 42: 1901-1927.
Jambor, J.L., Roberts, A.C. (2005) New mineral names. American Mineralogist: 90: 271-275.

Internet Links for PekoviteHide

Localities for PekoviteHide

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.
Tajikistan (TL)
 
  • Districts of Republican Subordination
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.; Agakhanov, A.A., Pautov, L.A., Uvarova, Y.A., Sokolova, E.V., Hawthorne, F.C., Karpenko, V.Yu. (2005) Senkevichite, CsKNaCa2TiO[Si7O18(OH)], a new mineral. New Data on Minerals: 40: 11-16.; Agakhanov, A.A., Pautov, L.A., Karpenko, V.Yu., Bekenova, G.K., Uvarova, Yu.A. (2011) Orlovite, KLi2 TiSi4 O11F, a new mineral of the mica group. New Data on Minerals: 46: 13-19.; Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Muftakhov, V.A. (2016) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new cesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine: 81: 113-122.
 
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