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Ferro-barroisite (Ferro-Barroisit)

Collectors Summary

Color blaugrün
Streak color weiß
Hardness (Mohs) 5 - 6
Crystal System monoklin, C2/m

Chemism

Chemical formula

☐NaCa(Fe2+3Al2)(Si7Al)O22(OH)2

Chemical composition

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

Unit weight: 894.14930881 u; Number of atoms in the formula: 42

Info

Empirical formula:

VcNaCa(Fe3Al2)(Si7Al)O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Vacancy

Vc

0.00

1

2.38

0.0000000

0.0000000

Hydrogen

H

0.23

2

4.76

1.0079470

2.0158940

Oxygen

O

42.94

24

57.14

15.9994300

383.9863200

Sodium

Na

2.57

1

2.38

22.9897702

22.9897702

Aluminium

Al

9.05

3

7.14

26.9815382

80.9446146

Silicon

Si

21.99

7

16.67

28.0855300

196.5987100

Calcium

Ca

4.48

1

2.38

40.0784000

40.0784000

Iron

Fe

18.74

3

7.14

55.8452000

167.5356000

Analysis wt%

SiO2 : 47.01, Al2O3 : 11.40, Fe2O3 : 8.93, FeO : 16.87, MgO : 4.06, CaO : 6.27, Na2O : 3.46, H2O : 2.01 (Ref: berechnet)

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:

Lapis Classification

VIII/F.09-120

VIII: SILIKATE
F: Ketten- und Bandsilikate
9: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Na-Ca-Amphibole

Classification by Hölzel

9.DI.310

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

Dana 8th edition

66.01.03b.06

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 Classification

IMA Classification

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

Optical Properties

Color

blaugrün

Streak color

weiß

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters α

90°

Cell parameters γ

90°

Physical Properties

Hardness (Mohs)

5 - 6

Preface

Author (Name, Year)

Leake, 1978

References

Canadian Mineralogist 35 (1997), 219

IMA group assignments





 
 
 
 
 
☐CaNaMg3Al2(Si7Al)O22(OH)2
monoklin
C2/m

 
 
 
 
 
☐CaNa(Fe2+)3Al2(Si7Al)O22(OH)2
monoklin
C2/m

 
 
 
 
 
☐(NaCa)(Mg3Al2)(Si7Al)O22(OH)2
monoklin
C2/m

 
 
 
 
 
CaNa(Fe2+,Mg)3Fe3+2[AlSi7O22](OH)2
monoklin
C2/m

 
 
 
 
 
NaCa(Fe2+)3(Fe3+)2(Si7Al)O22(OH)2
monoklin
C2/m

 
 
 
 
 
☐NaCa(Fe2+3Al2)(Si7Al)O22(OH)2
monoklin
C2/m

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Actuality: 27. Mar 2024 - 10:56:29

Other languages

German

Ferro-Barroisit

English

Ferro-barroisite

Spanish

Ferrobarroisita

French

Ferrobarroisite

Alternative Name

German

Ferrobarroisit

English

Ferrobarroisite

IDs

GUSID (Global unique identifier short form) 90Jv0MRIW0GOlLthrSIsMg
GUID (Global unique identifier) D06F42F7-48C4-415B-8E94-BB61AD222C32
Database ID 1173