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Eggletonite

Pictures (2 Images total)

Eggletonit
Views (File:
1252424666
): 1450, Rating: 8
Eggletonit
Bildbreite: 2,5 mm; Fundort: Big Rock Quarry (3M Quarry), Granite-Mountain-Komplex, Sweet Home, Pulaski Co., Arkansas, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/Arkansas/Pulaski Co./Sweet Home/Granite-Mountain-Komplex/Big Rock Quarry (3M Quarry)
Mineral: Eggletonite
Image: 1252424666
Rating: 8 (votes: 4)
License: Usage for Mineralienatlas project only
Eggletonit

Bildbreite: 2,5 mm; Fundort: Big Rock Quarry (3M Quarry), Granite-Mountain-Komplex, Sweet Home, Pulaski Co., Arkansas, USA

Copyright: Stephan Wolfsried
Contribution: Hg 2009-09-08
Locality: Big Rock Quarry (3M Quarry) / Granite-Mountain-Komplex / Sweet Home / Pulaski Co. / Arkansas / USA
Eggletonit
Views (File:
1252424705
): 820
Eggletonit
Bildbreite: 3 mm; Fundort: Big Rock Quarry (3M Quarry), Granite-Mountain-Komplex, Sweet Home, Pulaski Co., Arkansas, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/Arkansas/Pulaski Co./Sweet Home/Granite-Mountain-Komplex/Big Rock Quarry (3M Quarry)
Mineral: Eggletonite
Image: 1252424705
License: Usage for Mineralienatlas project only
Eggletonit

Bildbreite: 3 mm; Fundort: Big Rock Quarry (3M Quarry), Granite-Mountain-Komplex, Sweet Home, Pulaski Co., Arkansas, USA

Copyright: Stephan Wolfsried
Contribution: Hg 2009-09-08
Locality: Big Rock Quarry (3M Quarry) / Granite-Mountain-Komplex / Sweet Home / Pulaski Co. / Arkansas / USA

Collectors Summary

Color bräunlichgelb, goldbraun
Streak color bräunlich gelb
Hardness (Mohs) 3.5
Crystal System monoklin, Ia, I2/a

Chemism

Chemical formula

(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7·11H2O

Chemical composition

Aluminium, Calcium, Eisen, Mangan, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1615.29914724 u; Number of atoms in the formula: 98

Info

Empirical formula:

(Na0.6K0.3Ca0.1)2(Mn0.75Fe0.25)8(Si0.75Al0.25)12O29(OH)7·11H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.81

29

29.59

1.0079470

29.2304630

Oxygen

O

46.55

47

47.96

15.9994300

751.9732100

Sodium

Na

1.71

1.2

1.22

22.9897702

27.5877242

Aluminium

Al

5.01

3

3.06

26.9815382

80.9446146

Silicon

Si

15.65

9

9.18

28.0855300

252.7697700

Potassium

K

1.45

0.6

0.61

39.0983100

23.4589860

Calcium

Ca

0.50

0.2

0.20

40.0784000

8.0156800

Manganese

Mn

20.41

6

6.12

54.9380499

329.6282994

Iron

Fe

6.91

2

2.04

55.8452000

111.6904000

Strunz 9th edition incl. updates

9.EG.30

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
G: Doppelnetze mit sechsfach-Ringen
30:Ganophyllit-Gruppe

Lapis Classification

VIII/H.17-060

VIII: SILIKATE
H: Schichtsilikate
17: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen;

Classification by Hölzel

9.EG.230

9: SILICATES
E: Phyllosilicates
G: Hydrated Micas
2: With Mn

Dana 8th edition

74.01.02.02

74: Phyllosilicates Phyllosilicate Modulated Layers
01: Phyllosilicates Phyllosilicate Modulated Layers with joined islands
02: Ganophyllite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

bräunlichgelb, goldbraun

Streak color

bräunlich gelb

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.040

Birefringence chart\! Eggletonite title=Birefringence chart Eggletonite

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

1.566

RI value β

1.606

RI value γ / ε

1.606

Ri mean

1.593

2V angle

Biaxial (-) 9°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

m, 2/m

Space Group number

9, 15

Space Group

Ia, I2/a

Cell parameters a (Å)

5.554

Cell parameters b (Å)

13.72

Cell parameters c (Å)

25.00

Cell parameters a/b or c/a

0.405

Cell parameters c/b

1.822

Cell parameters α

90°

Cell parameters β

93.95

Cell parameters γ

90°

Z

2

Volumne (ų)

1900.497

X-Ray Powder Diffraction

12.4(100),
3.45(10),
3.13(30),
2.854(10),
2.691(20),
2.600(20),
2.462(20),
2.387(10)

XRD chart Eggletonite

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

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.84

2.823 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Peacor & Dunn & Simmons, 1984

References

Mineralogical Magazine 48 (1984), 93

Other languages

German

Eggletonit

Spanish

Eggletonita

French

Eggletonite

English

Eggletonite

Russian

Эгглетонит

Alternative Name

Ganophyllita

CNMNC (IMA)-Number

IMA 1982-059

CNMNC symbol

Symbol

Egg

Locations with GPS information