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Ferro-gedrite (Ferrogedrit)

Pictures (1 Images total)

Ferrogedrit
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Ferrogedrit
Dunkeloliv-Braun. Gruben am Spitzenberg, Bad Harzburg; Goslar, Landkreis; Niedersachsen. 9x3cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Deutschland/Niedersachsen/Goslar, Landkreis/Bad Harzburg/Gruben am Spitzenberg
Mineral: Ferro-gedrite
Image: 1453287732
License: Usage for Mineralienatlas project only
Ferrogedrit

Dunkeloliv-Braun. Gruben am Spitzenberg, Bad Harzburg; Goslar, Landkreis; Niedersachsen. 9x3cm.
Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2016-01-20
Locality: Gruben am Spitzenberg / Bad Harzburg / Goslar, Landkreis / Niedersachsen / Deutschland

Collectors Summary

Color grün, bräunlich grün, braun, grünblau
Streak color grauweiß
Hardness (Mohs) 5.75
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

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

Chemical composition

Aluminium, Eisen, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 902.2423718 u; Number of atoms in the formula: 41

Info

Empirical formula:

(Fe0.75Mg0.25)5Al2(Si6Al2)O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.22

2

4.88

1.0079470

2.0158940
Oxygen

O

42.56

24

58.54

15.9994300

383.9863200
Magnesium

Mg

3.37

1.25

3.05

24.3050600

30.3813250
Aluminium

Al

11.96

4

9.76

26.9815382

107.9261528
Silicon

Si

18.68

6

14.63

28.0855300

168.5131800
Iron

Fe

23.21

3.75

9.15

55.8452000

209.4195000

Analysis wt%

SiO2 : 38.41, Al2O3 : 19.72, TiO2 : 0.48, Fe2O3 : 2.21, FeO : 33.54, MnO : 2.30, Na2O : 1.16, H2O : 2.19 (Ref: American Mineralogist 57)

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

Lapis Classification

VIII/F.12-110

VIII: SILIKATE
F: Ketten- und Bandsilikate
12: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Orthorhombische Amphibole

Classification by Hölzel

9.DF.220

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
F: Amphiboles; Orthorhombic Amphiboles
2: Gedrite-Group

Dana 8th edition

66.01.02.07

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

grün, bräunlich grün, braun, grünblau

Streak color

grauweiß

Diaphaneity (Transparency)

transparent bis teilweise opak

max. Birefringence

0.028
Birefringence chart\! Ferro-gedrite title=Birefringence chart Ferro-gedrite

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

1.694

RI value β

1.710

RI value γ / ε

1.722

Ri mean

1.709

2V angle

Biaxial (-) 82°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

18.526

Cell parameters b (Å)

17.948

Cell parameters c (Å)

5.317

Cell parameters a/b or c/a

1.032

Cell parameters c/b

0.296

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

1767.927

X-Ray Powder Diffraction

8.95(10),
8.23(100),
4.632(10),
3.221(20),
3.043(70),
2.679(10),
2.581(10),
2.505(10)
XRD chart Ferro-gedrite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.75

VHN (Hardness Vickers)

630 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.57

3.39 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Tilley, 1939

References

Canadian Mineralogist 41 (2003), 1359

IMA group assignments

Other languages

German

Ferro-Gedrit

English

Ferro-gedrite

Spanish

Ferrogedrita

French

Ferrogedrite

Russian

Феррожедрит

Alternative Name

German

Ferrogedrit

Lapis-Mineralienverzeichnis 2018

English

Ferrogedrite

CNMNC symbol

Symbol

Fged

Locations with GPS information