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Magnesio-gedrite

Collectors Summary

Color grauweiß
Streak color weiß
Hardness (Mohs) 5.00 - 6.00
Cleavages gut
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

(Mg,Fe2+)5Al2Si6Al2O22(OH)2

Chemical composition

Aluminium, Eisen, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 823.3920218 u; Number of atoms in the formula: 41

Info

Empirical formula:

(Mg0.75Fe0.25)5Al2Si6Al2O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.24

2

4.88

1.0079470

2.0158940

Oxygen

O

46.63

24

58.54

15.9994300

383.9863200

Magnesium

Mg

11.07

3.75

9.15

24.3050600

91.1439750

Aluminium

Al

13.11

4

9.76

26.9815382

107.9261528

Silicon

Si

20.47

6

14.63

28.0855300

168.5131800

Iron

Fe

8.48

1.25

3.05

55.8452000

69.8065000

Strunz 9th edition incl. updates

9.DD.05 [†]

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
D: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Orthoamphibole
05:Amphibole: Ortho

IMA status

diskreditiert vom Amphibol-Subkomitee 1997 = Gedrit

IMA Classification

IMA Classification

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Magnesium-iron-manganese amphiboles  ⇒ Gedrite (Ged) amphiboles

Optical Properties

Color

grauweiß

Streak color

weiß

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Physical Properties

Hardness (Mohs)

5.00 - 6.00

Density (g/cm³)

2.95 (gemessen) 3.18 (berechnet)

Cleavages

gut

Preface

Author (Name, Year)

Leake, 1978

References

American Mineralogist 33 (1948), 263.

American Mineralogist 55 (1970), 1945.

American Mineralogist 63 (1978), 1023.

Canadian Mineralogist 35 (1997), 219.

IMA group assignments

Other languages

German

Magnesio-Gedrit

English

Magnesio-gedrite

Alternative Name

Magnesiogedrit