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Chloritoid-1A

Collectors Summary

Crystal System triklin, C1

Additional information / Summary

Es gibt 2 Polytypen von Chloritoid: monoklin: Chloritoid-2M, triklin: Chloritoid-1A

Chemism

Chemical formula

(Fe2+,Mg,Mn)2Al4Si2O10(OH)4

Chemical composition

Aluminium, Eisen, Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 484.70590678 u; Number of atoms in the formula: 26

Info

Empirical formula:

(Fe0.6Mg0.3Mn0.1)2Al4Si2O10(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.83

4

15.38

1.0079470

4.0317880
Oxygen

O

46.21

14

53.85

15.9994300

223.9920200
Magnesium

Mg

3.01

0.6

2.31

24.3050600

14.5830360
Aluminium

Al

22.27

4

15.38

26.9815382

107.9261528
Silicon

Si

11.59

2

7.69

28.0855300

56.1710600
Manganese

Mn

2.27

0.2

0.77

54.9380499

10.9876100
Iron

Fe

13.83

1.2

4.62

55.8452000

67.0142400

Classification by Hölzel

9.AH.145

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

Mineral status

Polytype

Variety / polytype of

Chloritoid

Optical Properties

max. Birefringence

0,007

2V angle

Biaxial (-) 55 – 88°

Pleochroism
Chloritoid-1A (triklin)
Chloritoid-1A (triklin)
Chloritoid und Pleochroismus
Copyright: H.-G. Stosch; Contribution: Stefan
Image: 1369301450
License: Usage for Mineralienatlas project only

α grünlichgrau, olivgrün, farblos, grünlich-blau;
β schieferblau, indigoblau, blaugrün;
γ farblos, gelbgrün, gelb

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

C1

Cell parameters a (Å)

9.50

Cell parameters b (Å)

5.48

Cell parameters c (Å)

9.16

Cell parameters a/b or c/a

1.734

Cell parameters c/b

1.672

Cell parameters α

96.88

Cell parameters β

101.82

Cell parameters γ

90.3

Volumne (ų)

463.179

X-Ray Powder Diffraction

4.475(100), 3.46(90), 2.97(80), 1.580(80), 2.70(70), 1.834(70), 3.25(60), 2.14(60), 2.40(50), 2.30(50), 2.77(40), 3.81(30), 2.66(30), 2.37(30), 2.26(30)
XRD chart Chloritoid-1A

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

References

http://www.staff.uni-mainz.de/tjohnson/Internal/KO-II.pdf

Other languages

German

Chloritoid-1A

English

Chloritoid-1A

Alternative Name

German

Chloritoid-2A

English

Chloritoid-2A