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Pellyite (Pellyit)

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Pellyit
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Pellyit
Bildbreite: 2 mm, Fundort: Esquire No. 8 claim, Big Creek, Fresno Co., Kalifornien, USA
Copyright: Luigi Chiappino; Contribution: thdun5
Location: USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 8 Claim
Mineral: Pellyite
Image: 1271788312
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Pellyit

Bildbreite: 2 mm, Fundort: Esquire No. 8 claim, Big Creek, Fresno Co., Kalifornien, USA

Copyright: Luigi Chiappino
Contribution: thdun5 2010-04-20
Locality: Esquire No. 8 Claim / Big Creek / Fresno Co. / Kalifornien (California) / USA

Collectors Summary

Color farblos, blassgelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 6
Cleavages prismatisch, schlecht entwickelt
Solubility ++ HCl
Crystal System orthorhombisch, Cmcm

Chemism

Chemical formula

Ba2Ca(Fe2+,Mg)2Si6O17

Chemical composition

Barium, Calcium, Eisen, Magnesium, Silicium, Sauerstoff

Unit weight: 851.15762 u; Number of atoms in the formula: 28

Info

Empirical formula:

Ba2Ca(Fe0.75Mg0.25)2Si6O17

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

31.96

17

60.71

15.9994300

271.9903100

Magnesium

Mg

1.43

0.5

1.79

24.3050600

12.1525300

Silicon

Si

19.80

6

21.43

28.0855300

168.5131800

Calcium

Ca

4.71

1

3.57

40.0784000

40.0784000

Iron

Fe

9.84

1.5

5.36

55.8452000

83.7678000

Barium

Ba

32.27

2

7.14

137.3277000

274.6554000

Analysis wt%

BaO : 36.00, CaO : 6.62, FeO : 12.18, MgO : 0.98, ZnO : 1.20, MnO : 1.54, SiO2 : 40.86 (Ref: American Mineralogist 76)

Strunz 9th edition incl. updates

9.DO.10

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
O: Ketten- und Bandsilikate mit 7-,8-,10-,12-und 14-periodischen Ketten
10:Pellyit-Gruppe

Lapis Classification

VIII/F.30-030

VIII: SILIKATE
F: Ketten- und Bandsilikate
30: Sechserketten [Si6O18] 12- und Sechserbänder [Si12O30] 12-

Classification by Hölzel

9.DN.140

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
N: ~[Si6O17]10--...~[Si6O15]6--...3-Band Xonotlite-Group

Dana 8th edition

78.06.03.01

78: Unclassified Silicate Minerals
06: Unclassified silicates possible tectosilicates

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, blassgelb

Streak color

weiß

Lustre

Glasglanz

max. Birefringence

0.006

Birefringence chart\! Pellyite title=Birefringence chart Pellyite

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

1.627 - 1.643

RI value β

1.629 - 1.645

RI value γ / ε

1.641 - 1.649

Ri mean

1.646

2V angle

Biaxial (+) 53° - 61° (gemessen)

Orientation

X = c; Y = b; Z = a

Dispersion

sehr stark; r > v

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

63

Space Group

Cmcm

Cell parameters a (Å)

15.677

Cell parameters b (Å)

7.151

Cell parameters c (Å)

14.209

Cell parameters a/b or c/a

2.192

Cell parameters c/b

1.987

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1592.917

X-Ray Powder Diffraction

5.91(40),
4.22(40),
3.83(50),
3.46(50),
3.43(100),
3.19(60),
3.17(40),
3.15(40)

XRD chart Pellyite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.51 (gemessen)

3.549 ( ρ calc. Mineralienatlas )

Cleavages

prismatisch, schlecht entwickelt

Instability

++ HCl

(Co-)Type locality

(Co-)Type locality

Kanada/Yukon-Territorium/Watson Lake Mining District/Gillespite-See/Ross, Fluss und Pelly, Fluss

Type material

University of British Columbia, Vancouver, Kanada, S-79-21844;

National Museum of Natural History, Washington, D. C., USA, 148587

Preface

Name from

Der Name eher den Pelly Fluss in Kanada in der Nähe der Typlokalität.

Author (Name, Year)

Montgomery & Thompson & Meagher, 1972

References

Montgomery, J. H., Thompson, R. M. & Meagher, E. P. - Pellyite, a new barium silicate mineral from the Yukon Territory - Canadian Mineralogist 11 (1972), 444

Meagher, E. P. - The atomic arrangement of pellyite - Ba2Ca(Fe,Mg)2Si6O17 - American Mineralogist 61 (1976), 67-73.

Pabst, A. & Harris, J. - Pellyite: new localities and new data. Canadian Mineralogist 22 (1984), 653-658.

Other languages

German

Pellyit

English

Pellyite

French

Pellyite

Spanish

Pellyíta

Russian

Пеллиит

CNMNC (IMA)-Number

IMA 1970-035

CNMNC symbol

Symbol

Ply

Locations with GPS information

IDs

GUSID (Global unique identifier short form) dEG79KcN-0CwPWFemTOjcA
GUID (Global unique identifier) F4BB4174-0DA7-40FB-B03D-615E9933A370
Database ID 2978