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Magnesio-holmquistite (Magnesioholmquistit)

Collectors Summary

Color graublau
Hardness (Mohs) 5.00 - 6.00
Cleavages gut
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

Li2(Mg,Fe++)3Al2Si8O22(OH)2

Chemical composition

Aluminium, Eisen, Lithium, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 775.1022154 u; Number of atoms in the formula: 41

Info

Empirical formula:

Li2(Mg0.75Fe0.25)3Al2Si8O22(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.26

2

4.88

1.0079470

2.0158940
Lithium

Li

1.79

2

4.88

6.9412000

13.8824000
Oxygen

O

49.54

24

58.54

15.9994300

383.9863200
Magnesium

Mg

7.06

2.25

5.49

24.3050600

54.6863850
Aluminium

Al

6.96

2

4.88

26.9815382

53.9630764
Silicon

Si

28.99

8

19.51

28.0855300

224.6842400
Iron

Fe

5.40

0.75

1.83

55.8452000

41.8839000

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

IMA status

= Holmquistit; diskreditiert vom Amphibol-Subkommitee (1997)

Mineral status

Varietät

Optical Properties

Color

graublau

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

X-Ray Powder Diffraction

8.107(100),
4.427(70),
3.612(50),
3.339(60),
2.797(40),
2.538(50),
2.134(40),
1.572(40)
XRD chart Magnesio-holmquistite

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

Physical Properties

Hardness (Mohs)

5.00 - 6.00

Density (g/cm³)

2.92

Cleavages

gut

References

Canadian Mineralogist 6 (1960), 504.

Acta Crystallographica B25 (1969), 394.

American Mineralogist 63 (1978), 1023.

Canadian Mineralogist 35 (1997), 219.

Other languages

German

Magnesio-Holmquistit

English

Magnesio-holmquistite

Alternative Name

Magnesioholmquistit