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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

Volumne (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

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

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Pekovit
Google-Bilder-Suche - search for: Pekovit
Mineralienatlas.de (Forum) - search for: Pekovit

English pages

Mindat - search for: Pekovite
Webmineral - search for:Pekovite
Handbook-of-Mineralogy - search for: Pekovite
RRUFF - Raman, XRD and other mineral data - search for: Pekovite
RRUFF - References and PDF downloads - search for: Pekovite
American-Mineralogist-Crystal-Structure-Database - search for: Pekovite
Strahlen.org - search for: Pekovite

Russian pages

Webmineral.ru - search for: Пековит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Pekovit
Crystal-Treasure.com - search for: Pekovit
Bosse - search for: Pekovit
Edelsteine Neuburg - Gundolf Fischer - search for: Pekovit

Locations with GPS information