Pekovite

Pekovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

Pekovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

Pekovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

Pekovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

Pekovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

Pekovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

About PekoviteHide

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.

Type Locality:

ⓘ Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan

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.

Unique IdentifiersHide

IMA Classification of PekoviteHide

Classification of PekoviteHide

Mineral SymbolsHide

Physical Properties of PekoviteHide

Optical Data of PekoviteHide

Type:

Biaxial (-)

RI values:

n_α = 1.597(2) n_β = 1.627(2) n_γ = 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)

Chemistry of PekoviteHide

Crystallography of PekoviteHide

Crystal StructureHide

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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 closedata_global _chemical_name_mineral 'Pekovite' loop_ _publ_author_name 'Pautov L A' 'Agakhanov A A' 'Sokolova E V' 'Hawthorne F C' _journal_name_full 'The Canadian Mineralogist' _journal_volume 42 _journal_year 2004 _journal_page_first 107 _journal_page_last 119 _publ_section_title ; Maleevite, BaB2Si2O8, and pekovite, SrB2Si2O8, new mineral species from the Dara-i-Pioz alkaline massif, Northern Tajikistan: Description and crystal structure ; _database_code_amcsd 0005929 _chemical_compound_source 'Dara-i-Pioz alkaline massif, Northern Tajikistan' _chemical_formula_sum 'Sr B2 Si2 O8' _cell_length_a 8.155 _cell_length_b 7.919 _cell_length_c 8.921 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 576.113 _exptl_crystal_density_diffrn 3.383 _symmetry_space_group_name_H-M 'P n m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2+z' '1/2+x,1/2-y,1/2-z' '1/2+x,y,1/2-z' '1/2-x,-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv SrA 0.38756 0.25000 0.07841 0.00898 BT1 0.26500 0.08080 0.41530 0.00490 SiT2 0.06105 0.94094 0.19163 0.00500 O1 0.20020 0.98330 0.06880 0.00850 O2 0.13440 0.96370 0.35970 0.00710 O3 0.41030 0.07250 0.32070 0.00750 O4 0.49240 0.75000 0.32770 0.00770 O5 0.19510 0.25000 0.41270 0.00860 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 SrA 0.01290 0.00370 0.01030 0.00000 -0.00050 0.00000 BT1 0.00830 0.00000 0.00630 -0.00070 0.00070 -0.00060 SiT2 0.00820 0.00060 0.00610 -0.00020 -0.00010 -0.00020 O1 0.01370 0.00470 0.00710 -0.00330 0.00210 -0.00180 O2 0.01140 0.00440 0.00550 -0.00170 -0.00120 -0.00020 O3 0.01130 0.00070 0.01060 0.00150 0.00330 -0.00050 O4 0.01270 0.00010 0.01000 0.00000 0.00190 0.00000 O5 0.00780 0.00460 0.01300 0.00000 0.00260 0.00000

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of PekoviteHide

Synonyms of PekoviteHide

Other Language Names for PekoviteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for PekoviteHide

References for PekoviteHide

Reference List:

Gorelova, L.A. (2023): Phase Transformations in Feldspar Group Minerals with Paracelsian Topology under High Temperature and High Pressure. Geologiya i Geofizika, (in press).

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

Jambor, John L., Roberts, Andrew C. (2005) New Mineral Names. American Mineralogist, 90 (1). 271-275 doi:10.2138/am.2005.429

Localities for PekoviteHide

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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

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- 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.

Tajikistan (TL)
Districts of Republican Subordination ⓘ Dara-i-Pioz Massif (TL)	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 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. Moscow. 17-22 Agakhanov, A. A., Pautov, L. A., Karpenko, V. Yu., Bekenova, G. K., Uvarova, Y. A. (2011) Orlovite, KLi2TiSi4O11F, a new mineral of the mica group. New Data on Minerals, 46. Moscow. 13-19 Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Muftakhov, Vyacheslav A. (2017) Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new caesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 81 (1) 113-122 doi:10.1180/minmag.2016.080.074 Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Garanin, Viktor K. (2017) Mendeleevite-(Nd), (Cs,□)6(□,Cs)6(□,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35, a new mineral from the Darai-Pioz alkaline massif, Tajikistan. Mineralogical Magazine, 81 (1) 135-141 doi:10.1180/minmag.2016.080.076