Pekovite Mineral Data

Pekovite Mineral Data

[Newest Minerals] [Rare Minerals] [Past Sale Items] [About Us] [A-Rocks Auctions]
T G Fine Minerals sells Australian Minerals from all the classic and current localities
We are one the most comprehensive sellers of these (Aussie) minerals in the world
Broken Hill specimens are our specialty along with fine worldwide minerals, Australian opals, fossils & gems

General Pekovite Information

Chemical Formula:

SrB2Si2O8

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

Empirical Formula:

Sr_0.97B_1.97Si_2.02O₈

Environment:

Found in a block of quartz, presumably the quartz core of a pegmatite or other type of vein. Sr-dominant analogue of danburite

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Moraine of the Dara-i-Pioz glacier, Alai range, Tien Shan, northern Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for Igor Viktorovich Pekov (1967-), Russian mineralogist and alkaline rock expert.

Synonym:

IMA2003-035

Pekovite Image

Images:

Pekovite

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

Axial Ratios:

a:b:c =1.0298:1:1.1265

Cell Dimensions:

a = 8.155, b = 7.919, c = 8.921, Z = 4; V = 576.11 Den(Calc)= 3.36

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Pautov L A , Agakhanov A A , Sokolova E V , Hawthorne F C , The Canadian Mineralogist , 42 (2004) p.107-119, Maleevite, BaB2Si2O8, and pekovite, SrB2Si2O8, new mineral species from the, Dara-i-Pioz alkaline massif, Northern Tajikistan: Description and crystal structure, Locality: Dara-i-Pioz alkaline massif, Northern Tajikistan

Physical Properties of Pekovite

Cleavage:

None

Color:

Colorless.

Density:

3.35

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Intergrown Crystals - Occurs as intergrown crystalline aggregates

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pekovite

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

Optical Data:

Biaxial (-), a=1.597, b=1.627, g=1.632, bire=0.0350

Calculated Properties of Pekovite

Electron Density:

r_electron=3.20 gm/cc
note: r_Pekovite=3.35 gm/cc.

Fermion Index

Fermion Index = 0.04432
Boson Index = 0.95568

Photoelectric:

PE_Pekovite= 33.16 barns/electron
U=PE_Pekovite x r_electron= 106.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pekovite is Not Radioactive

Pekovite Classification

Dana Class:

56.3.1.3 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.3)with [Si2O7] with borate groups

(56.3.1)Danburite Goup

56.3.1.1 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m

56.3.1.2 Maleevite! BaB2Si2O8 P nma 2/m 2/m 2/m

56.3.1.3 Pekovite ! SrB2Si2O8 P nma 2/m 2/m 2/m

Strunz Class:

VIII/J.08-30 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.08 - Reedmergnerite - Danburite series

VIII/J.08-10 Reedmergnerite NaBSi3O8 C1 1

VIII/J.08-20 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m

VIII/J.08-30 Pekovite SrB2Si2O8 P nma 2/m 2/m 2/m

VIII/J.08-40 Maleevite! BaB2Si2O8 P nma 2/m 2/m 2/m

Other Pekovite Information

References:

NAME( CanMin, v 42, p 107) PHYS. PROP.(CanMin, v 42, p 107) OPTIC PROP.(CanMin, v 42, p 107)

See Also:

Links to other databases for Pekovite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

Search for Pekovite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Pekovite :
AA Mineral Specimens
B and L Minerals
Crystal Vaults
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Pekovite Mineral Data :

Ask about Pekovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Pekovite Specimen Label here :

Pekovite

SrB2Si2O8
Dana No: 56.3.1.3 Strunz No: VIII/J.08-30
Locality:

Notes: