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Ferro-barroisite

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 sta­tus

anerkannt

Min­eral sta­tus

anerkanntes Mineral

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

Other languages

German

Ferro-Barroisit

English

Ferro-barroisite

Spanish

Ferrobarroisita

French

Ferrobarroisite

Alternative Name

German

Ferrobarroisit

English

Ferrobarroisite

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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German pages

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