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Ferro-Glaucophane

Collectors Summary

Color graublau, blauschwarz
Streak color blaugrau
Hardness (Mohs) 6
Crystal System monoklin, C2/m

Chemism

Chemical formula

Na2(Fe2+,Mg)3Al2Si8O22(OH)2

Chemical composition

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

Unit weight: 854.5095658 u; Number of atoms in the formula: 41

Info

Empirical formula:

Na2(Fe0.75Mg0.25)3Al2Si8O22(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

44.94

24

58.54

15.9994300

383.9863200
Sodium

Na

5.38

2

4.88

22.9897702

45.9795404
Magnesium

Mg

2.13

0.75

1.83

24.3050600

18.2287950
Aluminium

Al

6.32

2

4.88

26.9815382

53.9630764
Silicon

Si

26.29

8

19.51

28.0855300

224.6842400
Iron

Fe

14.70

2.25

5.49

55.8452000

125.6517000

Strunz 9th edition incl. updates

9.DE.25

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
25:Amphibole: Alkali

Lapis Classification

VIII/F.08-020

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

Classification by Hölzel

9.DJ.120

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
J: Amphiboles; Sodic Amphiboles
1: Glaucophane-Group

Dana 8th edition

66.01.03c.02

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
03c: Group 4, the sodic amphiboles

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium Amphiboles  ⇒ Glaucophane (Gln) amphiboles

Optical Properties

Color

graublau, blauschwarz

Streak color

blaugrau

max. Birefringence

0.021
Birefringence chart\! Ferro-Glaucophane title=Birefringence chart Ferro-Glaucophane

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

1.641

RI value β

1.659

RI value γ / ε

1.662

Ri mean

1.654

2V angle

Biaxial (-) 42°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.599

Cell parameters b (Å)

17.874

Cell parameters c (Å)

5.302

Cell parameters a/b or c/a

0.537

Cell parameters c/b

0.297

Cell parameters α

90°

Cell parameters β

103.63

Cell parameters γ

90°

Z

2

Volumne (ų)

884.059

X-Ray Powder Diffraction

8.27(90),
4.45(20),
3.32(10),
3.05(100),
2.929(20),
2.739(20),
2.687(30),
2.522(10)
XRD chart Ferro-Glaucophane

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.23 (gemessen)

3.21 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Italien/Aostatal (Valle d'Aosta), Region/Champdepraz/Herin Mine

Preface

Author (Name, Year)

Miyashiro, 1957

References

Canadian Mineralogist 41 (2003), 1355

IMA group assignments

Other languages

Spanish

Ferro-Glaucofana

English

Ferro-Glaucophane

French

Ferro-Glaucophane

German

Ferro-Glaukophan

Russian

Ферроглаукофан

Japanese

鉄藍閃石

CNMNC symbol

Symbol

Fgln

Locations with GPS information