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Magnesiodumortierite

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Magnesiodumortierit
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Magnesiodumortierit
rosafarbenes, in Glimmer eingewachsenes Aggregat von Magnesiodumortierit, Dora-Maira-Massiv, Cuneo, Piemont, Italen; BB < 5 mm, analysiert
Copyright: mintreasure.com; Contribution: openpit
Location: Italien/Piemont (Piemonte), Region/Cuneo, Provinz/Dora-Maira-Massiv
Mineral: Magnesiodumortierite
Image: 1681048753
License: Usage for Mineralienatlas project only
Magnesiodumortierit

rosafarbenes, in Glimmer eingewachsenes Aggregat von Magnesiodumortierit, Dora-Maira-Massiv, Cuneo, Piemont, Italen; BB < 5 mm, analysiert
Copyright: mintreasure.com
Contribution: openpit 2023-04-09
Locality: Dora-Maira-Massiv / Cuneo, Provinz / Piemont (Piemonte), Region / Italien

Collectors Summary

Color rosa, rot
Hardness (Mohs) 7.00 - 8.00
Cleavages undeutlich parallel zu {001}
Fracture muschelig, unregelmäßig
Crystal System orthorhombisch, Pmcn

Chemism

Chemical formula

MgAl6BSi3O17(OH)

Chemical composition

Aluminium, Magnesium, Silicium, Bor, Sauerstoff, Wasserstoff

Unit weight: 570.2602662 u; Number of atoms in the formula: 30

Info

Empirical formula:

MgAl6BSi3O17(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.18

1

3.33

1.0079470

1.0079470
Boron

B

1.90

1

3.33

10.8117000

10.8117000
Oxygen

O

50.50

18

60.00

15.9994300

287.9897400
Magnesium

Mg

4.26

1

3.33

24.3050600

24.3050600
Aluminium

Al

28.39

6

20.00

26.9815382

161.8892292
Silicon

Si

14.78

3

10.00

28.0855300

84.2565900

Analysis wt%

SiO2 : 31.70, Al2O3 : 47.30, TiO2 : 4.28, MgO : 7.80, B2O3 : 5.10, H2O : 3.50 (Ref: European Journal of Mineralogy 95)

Strunz 9th edition incl. updates

9.AJ.10

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
J: Insel(Neso)silikate mit BO3 Triangeln und /oder B[4], Be[4] Tetraedern, eckenteilend mit SiO4
10:Dumortierit-Gruppe

Lapis Classification

VIII/B.31-015

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

Classification by Hölzel

9.AK.105

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

Dana 8th edition

54.01.02.02

54: Nesosilicates Nesosilicate Borosilicates and Some Beryllosilicates
01: Nesosilicates Nesosilicate Borosilicates and Some Beryllosilicates with (BO3)
02: Dumortierite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Dumortierite supergroup  ⇒ Dumortierite group

Optical Properties

Color

rosa, rot

max. Birefringence

0.023
Birefringence chart\! Magnesiodumortierite title=Birefringence chart Magnesiodumortierite

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

1.678

RI value β

1.700

RI value γ / ε

1.701

Ri mean

1.693

2V angle

Biaxial (-) 38°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pmcn

Cell parameters a (Å)

11.91

Cell parameters b (Å)

20.40

Cell parameters c (Å)

4.730

Cell parameters a/b or c/a

0.584

Cell parameters c/b

0.232

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1149.22

X-Ray Powder Diffraction

6.01(60),
5.88(100),
3.489(60),
3.255(80),
3.074(50),
2.927(70),
2.131(50),
2.090(50)
XRD chart Magnesiodumortierite

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)

7.00 - 8.00

VHN (Hardness Vickers)

1650 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.22 (berechnet)

3.296 ( ρ calc. Mineralienatlas )

Cleavages

undeutlich parallel zu {001}

Fracture

muschelig, unregelmäßig

(Co-)Type locality

(Co-)Type locality

Italien/Piemont (Piemonte), Region/Cuneo, Provinz/Dora-Maira-Massiv

Preface

Author (Name, Year)

Ferraris & Ivaldi & Chopin, 1995

References

European Journal of Mineralogy 7 (1995), 167

Ferraris G, Ivaldi G, Chopin C (1995) Magnesiodumortierite, a new mineral from very-high-pressure rocks (Western Alps). Part I: Crystal structure, European Journal of Mineralogy 7, 167-174

Pieczka A, Evans R J, Grew E S, Groat L A, Ma C, Rossman G R (2013) The dumortierite supergroup. I. A new nomenclature for the dumortierite and holtite groups. Mineralogical Magazine 77, 2825-2839

IMA group assignments

Other languages

German

Magnesiodumortierit

Spanish

Magnesiodumortierita

French

Magnesiodumortierite

English

Magnesiodumortierite

Russian

Магнезиодюмортьерит

CNMNC (IMA)-Number

IMA 1992-050

CNMNC symbol

Symbol

Mdum

IDs

GUSID (Global unique identifier short form) FaLvcDsXhUqyexnBRc5YQA
GUID (Global unique identifier) 70EFA215-173B-4A85-B27B-19C145CE5840
Database ID 2299