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Ferri-barroisite

Additional Functions

Collectors Summary

Hardness (Mohs) 5 - 6
Crystal System monoklin, C2/m

Chemism

Chemical formula

CaNa(Fe2+,Mg)3Fe3+2[AlSi7O22](OH)2

Chemical composition

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

Unit weight: 928.2215274 u; Number of atoms in the formula: 41

Info

Empirical formula:

CaNa(Fe0.75Mg0.25)3Fe2[AlSi7O22](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

41.37

24

58.54

15.9994300

383.9863200
Sodium

Na

2.48

1

2.44

22.9897702

22.9897702
Magnesium

Mg

1.96

0.75

1.83

24.3050600

18.2287950
Aluminium

Al

2.91

1

2.44

26.9815382

26.9815382
Silicon

Si

21.18

7

17.07

28.0855300

196.5987100
Calcium

Ca

4.32

1

2.44

40.0784000

40.0784000
Iron

Fe

25.57

4.25

10.37

55.8452000

237.3421000

Analysis wt%

SiO2 : 49.22, Al2O3 : 7.78, Fe2O3 : 8.28, FeO : 10.49, MgO : 10.52, CaO : 7.45, Na2O : 3.54, H2O : 2.12 (Ref: Schweizerische Mineralogische und Petrographische

Mitteilungen 61)

Strunz 9th edition incl. updates

9.DE.20

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
E: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Klinoamphibole
20:

Classification by Hölzel

9.DI.360

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
I: Amphiboles; Sodiccalcic Amphiboles
3: Barroisite-Group

Dana 8th edition

66.01.03b.07

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration
03b: Group 3, the sodic-calcic amphiboles

IMA status

Neudefinition von der CNMNC anerkannt

IMA Classification

IMA Classification

 Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Sodium-calcium amphiboles  ⇒ Barroisite (Bar) amphiboles

Optical Properties

max. Birefringence

0.015~
Birefringence chart\! Ferri-barroisite title=Birefringence chart Ferri-barroisite

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

1.665

RI value γ / ε

1.680

2V angle

b nd 48°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

9.85

Cell parameters b (Å)

18.04

Cell parameters c (Å)

5.23

Cell parameters a/b or c/a

0.546

Cell parameters c/b

0.290

Cell parameters α

90°

Cell parameters β

104.50

Cell parameters γ

90°

Z

2

Volume (ų)

899.738

Physical Properties

Hardness (Mohs)

5 - 6

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.18 (berechnet)

3.426 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Leake, 1978

References

Hawthorne, Frank C., and Roberta Oberti (2006), Über die Klassifizierung der Amphibole: Canadian Mineralogist: 44(1): 1-21.

IMA group assignments

Other languages

German

Ferri-Barroisit

English

Ferri-barroisite

Spanish

Ferribarroisita

French

Ferribarroisite

Russian

Феррибарруазит

IDs

GUSID (Global unique identifier short form) 5lIan8TtvUOiVqrI_v-4vA
GUID (Global unique identifier) 9F1A52E6-EDC4-43BD-A256-AAC8FEFFB8BC
Database ID 1136