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Sodicgedrite

Additional Functions

Collectors Summary

Color hellbraun
Hardness (Mohs) 5.00 - 6.00
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

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

Chemical composition

Aluminium, Eisen, Magnesium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 851.5903488 u; Number of atoms in the formula: 42

Info

Empirical formula:

Na(Mg0.75Fe0.25)6Al(Si6Al2)O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.24

2

4.76

1.0079470

2.0158940

Oxygen

O

45.09

24

57.14

15.9994300

383.9863200

Sodium

Na

2.70

1

2.38

22.9897702

22.9897702

Magnesium

Mg

12.84

4.5

10.71

24.3050600

109.3727700

Aluminium

Al

9.51

3

7.14

26.9815382

80.9446146

Silicon

Si

19.79

6

14.29

28.0855300

168.5131800

Iron

Fe

9.84

1.5

3.57

55.8452000

83.7678000

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.12-115

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

Classification by Hölzel

9.DF.240

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

Dana 8th edition

66.01.02.08

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

Anerkannt von der CNMNC

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

hellbraun

max. Birefringence

0.018

Birefringence chart\! Sodicgedrite title=Birefringence chart Sodicgedrite

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

1.677

RI value β

1.681

RI value γ / ε

1.695

Ri mean

1.684

2V angle

Biaxial (+) 65°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

-

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

-

Cell parameters c/b

-

Cell parameters α

-

Cell parameters β

-

Cell parameters γ

-

Z

4

Volumne (ų)

-

X-Ray Powder Diffraction

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.00 - 6.00

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Preface

Author (Name, Year)

Leake et al., 1997

References

Canadian Mineralogist 35 (1997), 219

IMA group assignments

Other languages

German

Natriumgedrit

English

Sodicgedrite

French

Sodicgedrite

Spanish

Sodiogedrita

Alternative Name

Na Gedrite

German

Na-Gedrit

Spanish

Sodicgedrita

Sodium Gedrite

English

Sodiumgedrite