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Barroisite

Pictures (1 Images total)

Barroisit (hellblaue Körner nebem dem Granat)
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Barroisit (hellblaue Körner nebem dem Granat)

Anschliff. Wallhornalp, Prägraten, Ost-Tirol, Österreich; B:4,5cm.

Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2009-09-25
Locality: Wallhornalpe / Timmelbachtal / Prägraten / Lienz, Bezirk (Osttirol) / Tirol / Österreich

Collectors Summary

Color grün, dunkelgrün, blaugrün
Streak color weiß
Lustre Glasglanz
Cleavages vollkommen {110}, schneidet bei ~56 und ~124°; Teilbar auf {100},{001}
Crystal System monoklin, C2/m

Chemism

Chem­ical formula

☐(NaCa)(Mg3Al2)(Si7Al)O22(OH)2

Chem­ical com­po­si­tion

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

Unit weight: 799.52888881 u; Number of atoms in the formula: 42

Info

Empirical formula:

Vc(NaCa)(Mg3Al2)(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

0.25

2

4.76

1.0079470

2.0158940

Oxygen

O

48.03

24

57.14

15.9994300

383.9863200

Sodium

Na

2.88

1

2.38

22.9897702

22.9897702

Magnesium

Mg

9.12

3

7.14

24.3050600

72.9151800

Aluminium

Al

10.12

3

7.14

26.9815382

80.9446146

Silicon

Si

24.59

7

16.67

28.0855300

196.5987100

Calcium

Ca

5.01

1

2.38

40.0784000

40.0784000

Anal­y­sis wt%

SiO2 : 49.09, Al2O3 : 11.90, Fe2O3 : 9.32, FeO : 7.55, MgO : 9.88, CaO : 6.55, Na2O : 3.62, H2O : 2.10 (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.09-110

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

Clas­sifica­tion by Hölzel

9.DI.300

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

Dana 8th edi­tion

66.01.03b.05

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, vor IMA 1959 gefunden - vererbt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

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

Optical Properties

Color

grün, dunkelgrün, blaugrün

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

Lus­tre

Glasglanz

2V angle

Biaxial

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell param­e­ters a (Å)

9.90

Cell param­e­ters b (Å)

18.04

Cell param­e­ters c (Å)

5.33

Cell param­e­ters a/b or c/a

0.549

Cell param­e­ters c/b

0.295

Cell param­e­ters α

90°

Cell param­e­ters β

106.75

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

911.528

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.917 (berechnet)

2.913 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen {110}, schneidet bei ~56 und ~124°; Teilbar auf {100},{001}

Tenac­ity

spröde

Preface

Author (Name, Year)

Murgoci, 1922

References

Canadian Mineralogist 35 (1997), 219

Comptes Rendus de l’Académie des Sciences de Paris 175 (1922), 426

Tschermaks Mineralogische und Petrographische Mitteilungen 6 (1957), 215

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: 19. May 2022 - 15:40:38

Other languages

German

Barroisit

Spanish

Barroisita

English

Barroisite

French

Barroisite

Russian

Барруазит

Simplified Chinese

冻蓝闪石

CNMNC symbol

Symbol

Brs

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

German pages

DeWikiPedia - search for: Barroisit
Google-Bilder-Suche - search for: Barroisit
Mineralienatlas.de (Forum) - search for: Barroisit

English pages

Mindat - search for: Barroisite
Webmineral - search for:Barroisite
Handbook-of-Mineralogy - search for: Barroisite
RRUFF - Raman, XRD and other mineral data - search for: Barroisite
RRUFF - References and PDF downloads - search for: Barroisite
American-Mineralogist-Crystal-Structure-Database - search for: Barroisite
Strahlen.org - search for: Barroisite

Russian pages

Webmineral.ru - search for: Барруазит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Barroisit
Crystal-Treasure.com - search for: Barroisit
Bosse - search for: Barroisit
Edelsteine Neuburg - Gundolf Fischer - search for: Barroisit

Locations with GPS information