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Magnesio-gedrite (Magnesio-Gedrit)

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

 
Amphibole supergroup
 
 
 

 
 
(OH,F,Cl)-dominant amphiboles
 
 
 

 
 
 
Magnesium-iron-manganese amphiboles
 
 
 

 
 
 
 
Gedrite (Ged) amphiboles
 
 
 

 
 
 
 
 
Ferrogedrite
(Fe2+,Mg)5Al2(Si6Al2)O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
Gedrite
(Mg,Fe2+)5Al2(Si6Al2)O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
Magnesio-gedrite
(Mg,Fe2+)5Al2Si6Al2O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
Sodicgedrite
Na(Mg,Fe2+)6Al(Si6Al2)O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
Sodic-ferrogedrite
NaFe62+Al[OH|AlSi3O11]2
 
 

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Actuality: 24. Jun 2022 - 03:23:39

Other languages

German

Magnesio-Gedrit

English

Magnesio-gedrite

Alternative Name

Magnesiogedrit

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