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Gedrite (Gedrit)

Pictures (4 Images total)

Gedrit
Views (Image: 1249732723): 3578
Gedrit

FO: Västra Silvberg, Ludvika, Dalarna, Schweden; Größe: 4 x 3 cm; radialstrahlig grün

Collection: rtbstone
Copyright: Archiv: Berthold Stein (rtbstone)
Contribution: rtbstone 2009-08-08
Locality: Västra Silvberg / Ludvika / Dalarna, Provinz / Schweden
Gedrit
Views (Image: 1457174054): 1749
Gedrit

Gedrit X X; Stufe ca. 20 cm x 13 cm; mit schönen radialstrahligen Gedrit Sonnen bis 3 cm D; Skisshyttan Väster Silvberg Schweden

Collection: Privat - Museum M+M. Sendelbach
Copyright: PriMus1
Contribution: PriMus1 2016-03-05
Locality: Västra Silvberg / Ludvika / Dalarna, Provinz / Schweden
Gedrit
Views (Image: 1457174331): 1745
Gedrit

Gedrit X X; Stufe ca. 40 cm x 30 cm; mit schönen radialstrahligen Gedrit Sonnen bis 2 cm D; Skisshyttan Väster Silvberg Schweden

Collection: Privat - Museum M+M. Sendelbach
Copyright: PriMus1
Contribution: PriMus1 2016-03-05
Locality: Västra Silvberg / Ludvika / Dalarna, Provinz / Schweden
Gedrit
Views (Image: 1457174535): 1803
Gedrit

Gedrit X X; Stufe ca. 15 cm x 12 cm; mit einer sehr schönen; radialstrahligen Gedrit Sonne 11 cm D; Skisshyttan Väster Silvberg Schweden

Collection: Privat - Museum M+M. Sendelbach
Copyright: PriMus1
Contribution: PriMus1 2016-03-05
Locality: Västra Silvberg / Ludvika / Dalarna, Provinz / Schweden

Collectors Summary

Color braun, braun grün, grün, grau, grauweiß
Streak color grauweiß
Hardness (Mohs) 5.75
Solubility +++ HF, - andere Säuren
Crystal System orthorhombisch, Pnma

Chemism

Chem­ical formula

(Mg,Fe2+)5Al2(Si6Al2)O22(OH)2

Chem­ical com­po­si­tion

Aluminium, Eisen, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 823.3920218 u; Number of atoms in the formula: 41

Info

Empirical formula:

(Mg0.75Fe0.25)5Al2(Si6Al2)O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.24

2

4.88

1.0079470

2.0158940

Oxygen

O

46.63

24

58.54

15.9994300

383.9863200

Magnesium

Mg

11.07

3.75

9.15

24.3050600

91.1439750

Aluminium

Al

13.11

4

9.76

26.9815382

107.9261528

Silicon

Si

20.47

6

14.63

28.0855300

168.5131800

Iron

Fe

8.48

1.25

3.05

55.8452000

69.8065000

Anal­y­sis wt%

SiO2 : 44.89, TiO2 : 0.67, Al2O3 : 17.91, Fe2O3 : 0.67, FeO : 13.31, MgO : 18.09, CaO : 0.40, Na2O : 1.45, H2O : 2.02 (Ref: American Mineralogist 59)

Strunz 9th edi­tion incl. updates

9.DD.05

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
D: Ketten- und Bandsilikate mit 2-periodischen Doppelketten, Si4O11; Amphibol-Familie, Orthoamphibole
05:Amphibole: Ortho

Lapis Clas­sifica­tion

VIII/F.12-100

VIII: SILIKATE
F: Ketten- und Bandsilikate
12: Zweierbänder [Si4O11] 6-; Amphibol-Gruppe; Orthorhombische Amphibole

Clas­sifica­tion by Hölzel

9.DF.200

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
F: Amphiboles; Orthorhombic Amphiboles
2: Gedrite-Group

Dana 8th edi­tion

66.01.02.06

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
01: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with P=2 amphibole configuration

IMA sta­tus

Neudefinition von der CNMNC anerkannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Amphibole supergroup  ⇒ (OH,F,Cl)-dominant amphiboles  ⇒ Magnesium-iron-manganese amphiboles  ⇒ Gedrite (Ged) amphiboles

Optical Properties

Color

braun, braun grün, grün, grau, grauweiß

Streak color

grauweiß

Diaphane­ity (Trans­parency)

transparent bis teilweise opak

max. Birefrin­gence

0.019

Birefringence chart\! Gedrite title=Birefringence chart Gedrite

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

1.671

RI value β

1.681

RI value γ / ε

1.690

Ri mean

1.681

2V angle

Biaxial (-) 75°

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell param­e­ters a (Å)

18.594

Cell param­e­ters b (Å)

17.890

Cell param­e­ters c (Å)

5.304

Cell param­e­ters a/b or c/a

1.039

Cell param­e­ters c/b

0.296

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

1764.358

X-Ray Pow­der Diffrac­tion

8.97(50),
8.27(80),
4.48(40),
3.65(40),
3.35(40),
3.23(70),
3.06(100),
2.50(40)

XRD chart Gedrite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5.75

VHN (Hard­ness Vick­ers)

630 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.15 - 3.57 / Durchschnittlich = 3.36

3.1 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ HF, - andere Säuren

Preface

Author (Name, Year)

Dufrenoy, 1836

References

Canadian Mineralogist 41 (2003), 1355

IMA group assignments





 
 
 
 
 
(Fe2+,Mg)5Al2(Si6Al2)O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
(Mg,Fe2+)5Al2(Si6Al2)O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
(Mg,Fe2+)5Al2Si6Al2O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
Na(Mg,Fe2+)6Al(Si6Al2)O22(OH)2
orthorhombisch
Pnma

 
 
 
 
 
NaFe62+Al[OH|AlSi3O11]2
 
 

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Actuality: 27. Jun 2022 - 04:03:49

Other languages

German

Gedrit

Spanish

Gedrita

English

Gedrite

French

Gedrite

Russian

Жедрит

Simplified Chinese

铝直闪石

Alternative Name

German

Bidalotit

Spanish

Bidalotita

English

Bidalotite

German

Ferri-gedrit

English

Ferri-gedrite

Spanish

Magnesiogedrita

Magnesiogedrite

CNMNC symbol

Symbol

Ged

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Жедрит

Mineral Dealer

German pages

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

Locations with GPS information