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Magnesiochloritoid

Collectors Summary

Color grünlich grau, grünlich schwarz
Streak color grauweiß
Hardness (Mohs) 6.5
Solubility +++ H2SO4
Crystal System monoklin, C2/c

Chemism

Chemical formula

MgAl2SiO5(OH)2

Chemical composition

Aluminium, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 220.3655704 u; Number of atoms in the formula: 13

Info

Empirical formula:

MgAl2SiO5(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.91

2

15.38

1.0079470

2.0158940
Oxygen

O

50.82

7

53.85

15.9994300

111.9960100
Magnesium

Mg

11.03

1

7.69

24.3050600

24.3050600
Aluminium

Al

24.49

2

15.38

26.9815382

53.9630764
Silicon

Si

12.74

1

7.69

28.0855300

28.0855300

Analysis wt%

SiO2 : 24.70, Al2O3 : 43.80, Fe2O3 : 3.00, FeO : 8.90, MgO : 10.80, H2O : 7.70 (Ref: Schweizerische Mineralogische und Petrographische

Mitteilungen 63)

Strunz 9th edition incl. updates

9.AF.85

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
85:Chloritoid-Gruppe

Lapis Classification

VIII/B.24-010

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
24: Kationen mit Koordinationszahlen zwischen [8] und [12]

Classification by Hölzel

9.AH.150

9: SILICATES
A: Nesosilicates
H: Nesosilicates with O + (OH, OH,X, X)
1: C small; Staurolite-Chloritoid-Group

IMA status

Mit Anerkennung der CNMNC umbenannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

grünlich grau, grünlich schwarz

Streak color

grauweiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.010
Birefringence chart\! Magnesiochloritoid title=Birefringence chart Magnesiochloritoid

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

1.698

RI value β

1.700

RI value γ / ε

1.708

Ri mean

1.702

2V angle

Biaxial (+) 45°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

9.448

Cell parameters b (Å)

5.466

Cell parameters c (Å)

18.148

Cell parameters a/b or c/a

1.729

Cell parameters c/b

3.320

Cell parameters α

90°

Cell parameters β

101.43

Cell parameters γ

90°

Z

8

Volumne (ų)

918.626

X-Ray Powder Diffraction

4.46(100),
2.964(20),
2.459(10),
2.356(10),
2.306(10),
1.574(10),
1.482(10),
1.362(10)
XRD chart Magnesiochloritoid

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)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.5 - 3.6 / Durchschnittlich = 3.55

3.187 ( ρ calc. Mineralienatlas )

Instability

+++ H2SO4

(Co-)Type locality

(Co-)Type locality

Schweiz/Wallis, Kanton/Visp/Zermatt-Saas-Fee-Gebiet/Saastal/Saas-Almagell/Allalin-Gletscher

Preface

Author (Name, Year)

Chopin, 1983

References

Bulletin de Minéralogie 106 (1983), 715

Other languages

German

Magnesiochloritoid

English

Magnesiochloritoid

French

Magnesiochloritoide

Spanish

Magnesiocloritoide

Russian

Магнезиохлоритоид

Japanese

苦土ｸﾛﾘﾄｲﾄﾞ

Simplified Chinese

镁硬绿泥石

Alternative Name

English

Sismondite

CNMNC symbol

Symbol

Mcld

Locations with GPS information