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Pekovite

Collectors Summary

Color farblos
Lustre Glasglanz
Hardness (Mohs) 6.5
Cleavages keine
Fracture uneben
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

SrB2Si2O8

Additional chem. information

Sr-dominantes Analog von Danburit

Chemical composition

Silicium, Strontium, Bor, Sauerstoff

Unit weight: 293.4109 u; Number of atoms in the formula: 13

Info

Empirical formula:

SrB2Si2O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

7.37

2

15.38

10.8117000

21.6234000
Oxygen

O

43.62

8

61.54

15.9994300

127.9954400
Silicon

Si

19.14

2

15.38

28.0855300

56.1710600
Strontium

Sr

29.86

1

7.69

87.6210000

87.6210000

Analysis wt%

SiO2 : 41.56, B2O3 : 23.39, SrO : 34.15 (Ref: Canadian Mineralogist 2004)

Strunz 9th edition incl. updates

9.FA.65

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
65:Danburit-Gruppe

Lapis Classification

VIII/J.08-030

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
8: Ohne tetraederfremde Anionen

Classification by Hölzel

9.FD.370

9: SILICATES
F: Tektosilicates
D: Plagioclase-Group

Dana 8th edition

56.03.01.03

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
03: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with [Si2O7] with borate groups
01: Danburite Goup

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.035
Birefringence chart\! Pekovite title=Birefringence chart Pekovite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.597

RI value β

1.627

RI value γ / ε

1.632

Ri mean

1.619

2V angle

Biaxial (-) 43°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

8.155

Cell parameters b (Å)

7.919

Cell parameters c (Å)

8.921

Cell parameters a/b or c/a

1.030

Cell parameters c/b

1.127

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

576.113

X-Ray Powder Diffraction

5.94(60), 3.62(100), 3.51(90), 3.31(80), 3.01(60), 2.786(90), 2.706(60), 1.982(70)
XRD chart Pekovite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.5

VHN (Hardness Vickers)

953 (50g)

Density (g/cm³)

3.35

3.383 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Tadschikistan/Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij)/Dara-i-Pioz (Darai-Pioz)

Preface

Author (Name, Year)

Pautov & Agakhanov & Sokolova & Hawthorne, 2004

References

Canadian Mineralogist 42 (2004), 107

Other languages

German

Pekovit

Spanish

Pekovita

French

Pekovite

English

Pekovite

Russian

Пековит

Traditional Chinese

矽鍶硼石

Simplified Chinese

硅锶硼石

CNMNC (IMA)-Number

IMA 2003-035

CNMNC symbol

Symbol

Pko

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 5tt-5mk8OUiCpTqGGYvm1A
GUID (Global unique identifier) E67EDBE6-3C69-4839-82A5-3A86198BE6D4
Database ID 4480