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Werdingite

Collectors Summary

Color bräunlichgelb
Streak color weiß
Hardness (Mohs) 7
Cleavages undeutlich or fehlt
Fracture muschelig
Crystal System triklin, P1

Chemism

Chemical formula

(Mg,Fe)2Al12(Al,Fe)2Si4(B,Al)4O37

Chemical composition

Aluminium, Eisen, Magnesium, Silicium, Bor, Sauerstoff

Unit weight: 1220.2912239 u; Number of atoms in the formula: 61

Info

Empirical formula:

(Mg0.75Fe0.25)2Al12(Al0.75Fe0.25)2Si4(B0.75Al0.25)4O37

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Boron

B

2.66

3

4.92

10.8117000

32.4351000

Oxygen

O

48.51

37

60.66

15.9994300

591.9789100

Magnesium

Mg

2.99

1.5

2.46

24.3050600

36.4575900

Aluminium

Al

32.06

14.5

23.77

26.9815382

391.2323039

Silicon

Si

9.21

4

6.56

28.0855300

112.3421200

Iron

Fe

4.58

1

1.64

55.8452000

55.8452000

Analysis wt%

SiO2 : 19.83, MgO : 4.46, FeO : 5.06, Al2O3 : 59.49, B2O3 : 10.19 (Ref: American Mineralogist 90)

Strunz 9th edition incl. updates

9.BD.35

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
D: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in tetrahedraler [4] und/oder anderer Koordination
35:Werdingit-Gruppe

Lapis Classification

VIII/B.31-050

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
31: Kationen mit Koordinationszahlen zwischen [8] und [12]; Beryllium- und Bor-Inselsilikate

Classification by Hölzel

9.AK.150

9: SILICATES
A: Nesosilicates
K: Boro and Beryllo Nesosilicates
1: C small; Dumortierite-Kornerupine-Group

Dana 8th edition

56.03.02.01

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
03: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with [Si2O7] with borate groups

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

bräunlichgelb

Streak color

weiß

max. Birefringence

0.037

Birefringence chart\! Werdingite title=Birefringence chart Werdingite

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

1.614

RI value β

1.646

RI value γ / ε

1.651

Ri mean

1.637

2V angle

Biaxial (-) 33°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

7.955

Cell parameters b (Å)

8.152

Cell parameters c (Å)

11.406

Cell parameters a/b or c/a

0.976

Cell parameters c/b

1.399

Cell parameters α

110.45

Cell parameters β

110.85

Cell parameters γ

84.67

Z

1

Volume (ų)

647.251

X-Ray Powder Diffraction

5.433(80),
5.226(100),
4.979(70),
3.437(30),
3.392(50),
2.708(60),
2.194(50),
1.527(40)

XRD chart Werdingite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7

VHN (Hardness Vickers)

1300 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.04 (gemessen)

3.131 ( ρ calc. Mineralienatlas )

Cleavages

undeutlich or fehlt

Fracture

muschelig

Tenacity

nicht erwähnt

Preface

Author (Name, Year)

Moore & Waters & Niven, 1990

References

American Mineralogist 75 (1990), 415

Other languages

German

Werdingit

Spanish

Werdingita

French

Werdingite

English

Werdingite

Russian

Вердингит

Alternative Name

German

Mg-Werdingit

Mg-Werdingite

CNMNC (IMA)-Number

IMA 1988-023

CNMNC symbol

Symbol

Wrd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 7Wlute39tUaUC85tMV3Cag
GUID (Global unique identifier) B56E69ED-FDED-46B5-940B-CE6D315DC26A
Database ID 4149