Mineralogy Database

Pekovite Mineral Data

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General Pekovite Information

Help on Chemical  Formula: Chemical Formula: SrB2Si2O8
Help on Composition: Composition: Molecular Weight = 291.02 gm
   Strontium  29.21 %  Sr   34.54 % SrO
   Silicon    19.49 %  Si   41.71 % SiO2
   Boron       7.32 %  B    23.56 % B2O3
   Oxygen     43.98 %  O
             ______        ______ 
             100.00 %       99.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr0.97B1.97Si2.02O8
Help on Environment: Environment: Found in a block of quartz, presumably the quartz core of a pegmatite or other type of vein. Sr-dominant analogue of danburite
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Igor Viktorovich Pekov (1967-), Russian mineralogist and alkaline rock expert.
Help on Synonym: Synonym: Bonchevite - mixture of pekoite and galenobismutiteBonchevite - mixture of pekoite and galenobismutite

Pekovite Image

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Comments: Backscatter elecron image of (a) an intergrowth of pekovite (Pkv) and pectolite (Pct) and (b), an enlarged area of (a) showing details. (CanMin, v 42, p 110).
Location: Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Scale: See Image.
© Canadian Mineralogist

Pekovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0298:1:1.1265
Help on Cell Dimensions: Cell Dimensions: a = 8.155, b = 7.919, c = 8.921, Z = 4; V = 576.11 Den(Calc)= 3.36
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.62(1)(210), 2.786(0.9)(103,013,122), 3.51(0.9)(112),3.31(0.8)(121), 1.982(0.7)(232), 2.706(0.6), 3.01(0.6)(202), 5.94(0.6)(011),

Physical Properties of Pekovite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 3.35
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Intergrown Crystals - Occurs as intergrown crystalline aggregates
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pekovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1841,KPDmeas= 0.1847,KC= 0.1875
Ncalc = 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.597, b=1.627, g=1.632, bire=0.0350

Calculated Properties of Pekovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.20 gm/cc
note: Specific Gravity of Pekovite =3.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEPekovite = 33.16 barns/electron
U=PEPekovite x rElectron Density= 106.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pekovite is Not Radioactive

Pekovite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.03)with [Si2O7] with borate groups
  (56.03.01)Danburite Goup Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m Maleevite! BaB2Si2O8 P nma 2/m 2/m 2/m Pekovite! SrB2Si2O8 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.FA.65 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
09.FA.65 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m
09.FA.65 Maleevite! BaB2Si2O8 P nma 2/m 2/m 2/m
09.FA.65 Pekovite! SrB2Si2O8 P nma 2/m 2/m 2/m

Other Pekovite Information

Help on References: References: NAME( CanMin, v 42, p 107) PHYS. PROP.(CanMin, v 42, p 107) OPTIC PROP.(CanMin, v 42, p 107)
Help on See Also: See Also: Links to other databases for Pekovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.FA.65





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