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Ferri-ferro-barroisite

Additional Functions

Collectors Summary

Color dunkelgrün, schwarz
Lustre Glasglanz
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

NaCa(Fe2+)3(Fe3+)2(Si7Al)O22(OH)2

Chem­ical com­po­si­tion

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

Unit weight: 951.8766324 u; Number of atoms in the formula: 41

Info

Empirical formula:

NaCa(Fe)3(Fe)2(Si7Al)O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.21

2

4.88

1.0079470

2.0158940
Oxygen

O

40.34

24

58.54

15.9994300

383.9863200
Sodium

Na

2.42

1

2.44

22.9897702

22.9897702
Aluminium

Al

2.83

1

2.44

26.9815382

26.9815382
Silicon

Si

20.65

7

17.07

28.0855300

196.5987100
Calcium

Ca

4.21

1

2.44

40.0784000

40.0784000
Iron

Fe

29.33

5

12.20

55.8452000

279.2260000

Anal­y­sis wt%

SiO2 : 45.54, Al2O3 : 5.52, Fe2O3 : 17.29, FeO : 16.34, MgO : 3.93, CaO : 6.07, Na2O : 3.36, H2O : 1.95 (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:

Clas­sifica­tion by Hölzel

9.DI.370

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

Dana 8th edi­tion

66.01.03b.08a

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 von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

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

Optical Properties

Color

dunkelgrün, schwarz

Diaphane­ity (Trans­parency)

semitransparent

Lus­tre

Glasglanz

max. Birefrin­gence

0.011
Birefringence chart\! Ferri-ferro-barroisite title=Birefringence chart Ferri-ferro-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

1.696

RI value β

1.704

RI value γ / ε

1.707

Ri mean

1.702

2V angle

Biaxial (-) 62°, 66° (gemessen) 63° (berechnet)

Pleochro­ism

Farbnuancen von gelb, grün und blau

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°

Preface

Author (Name, Year)

Leake, 1997

References

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

IMA group assignments

 
Amphibole supergroup
 
 
 

 
 
(OH,F,Cl)-dominant amphiboles
 
 
 

 
 
 
Sodium-calcium amphiboles
 
 
 

 
 
 
 
Barroisite (Bar) amphiboles
 
 
 

 
 
 
 
 
Alumino-barroisite ?
☐CaNaMg3Al2(Si7Al)O22(OH)2
monoklin
C2/m

 
 
 
 
 
Alumino-ferro-barroisite ?
☐CaNa(Fe2+)3Al2(Si7Al)O22(OH)2
monoklin
C2/m

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

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

 
 
 
 
 
Ferri-ferro-barroisite
NaCa(Fe2+)3(Fe3+)2(Si7Al)O22(OH)2
monoklin
C2/m

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

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Actuality: 19. May 2022 - 12:19:40

Other languages

German

Ferri-Ferro-Barroisit

French

Ferri-Ferrobarroisite

English

Ferri-ferro-barroisite

Spanish

Ferriferrobarroisita

old name

English

Ferro-ferri-barroisite

umbenannt vom Amphibol-Subkomitee (1997)

Alternative Name

German

Ferri-Ferrobarroisit

English

Ferri-ferrobarroisite

English

Ferriferrobarroisite

Ferro-ferribarroisite

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