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Laihunite (Ferrifayalite)

Pictures (2 Images total)

Laihunit auf Fayalit
Views (File:
1253718388
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Laihunit auf Fayalit
Bildbreite: 2 mm; Fundort: Obsidian Cliffs, North Sister Mountain, McKenzie Pass, Lane Co., Oregon, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/Oregon/Lane Co./McKenzie Pass/North Sister Mountain/Obsidian Cliffs
Mineral: Laihunite
Image: 1253718388
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Laihunit auf Fayalit

Bildbreite: 2 mm; Fundort: Obsidian Cliffs, North Sister Mountain, McKenzie Pass, Lane Co., Oregon, USA

Copyright: Stephan Wolfsried
Contribution: Hg 2009-09-23
Locality: Obsidian Cliffs / North Sister Mountain / McKenzie Pass / Lane Co. / Oregon / USA
Laihunit
Views (File:
1254465215
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Laihunit
Bildbreite: 2 mm; Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Vordereifel, Verbandsgemeinde/Ettringen/Bellerberg/Ettringer Bellerberg (Stbr. Caspar)
Mineral: Laihunite
Image: 1254465215
License: Usage for Mineralienatlas project only
Laihunit

Bildbreite: 2 mm; Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2009-10-02
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Vordereifel, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

You find additional specimen at the Geolitho Museum

Collectors Summary

Color dunkelbraun, schwarz
Streak color hellbraun
Lustre Metallglanz
Hardness (Mohs) 6
Cleavages {001} gut, {100} vollkommen, {010} vollkommen
Crystal System monoklin, P21/a

Chemism

Chemical formula

Fe2+Fe3+2(SiO4)2

Empirical formula (analysis)

(Fe2+1.18Mg0.08)Fe3+2(Si0.93O4)2

Additional chem. information

Formel laut CNMNC (Jun. 2013): (Fe3+,Fe2+,☐)2(SiO4)

Chemical composition

Eisen, Silicium, Sauerstoff

Unit weight: 359.7666666 u; Number of atoms in the formula: 13.12

Info

Empirical formula:

(Fe1.18Mg0.08)Fe2(Si0.93O4)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

35.58

8

60.98

15.9994300

127.9954400

Magnesium

Mg

0.54

0.08

0.61

24.3050600

1.9444048

Silicon

Si

14.52

1.86

14.18

28.0855300

52.2390858

Iron

Fe

49.36

3.18

24.24

55.8452000

177.5877360

Strunz 9th edition incl. updates

9.AC.05

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
C: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] Koordination
05:Olivin-Gruppe

Lapis Classification

VIII/A.04-050

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
4: Kationen in oktaedrischer Koordination [6]; Olivin-Gruppe

Classification by Hölzel

9.AB.510

9: SILICATES
A: Nesosilicates
B: Olivine-Group

IMA status

anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkelbraun, schwarz

Streak color

hellbraun

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) -, -, -
(546) 13.4, -, 13.4
(589) 12.4, -, 12.4
(650) 12.4, -, 12.4

Reflection chart Laihunite

Reflectivity Ø

12.73

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

10.21

Cell parameters b (Å)

4.812

Cell parameters c (Å)

5.813

Cell parameters a/b or c/a

2.122

Cell parameters c/b

1.208

Cell parameters α

90°

Cell parameters β

90.87°

Cell parameters γ

90°

Z

2

Volume (ų)

285.563

X-Ray Powder Diffraction

3.78(60),
3.47(90),
2.78(80),
2.520(100),
2.405(60),
2.260(50),
1.750(70)

XRD chart Laihunite

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

Polytypes

Laihunite-3M

0.4Fe2+0.8Fe3+0.8SiO4

monoklin

P21/b

2/m

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

Density (g/cm³)

3.967 (gemessen) 4.11 (berechnet)

4.184 ( ρ calc. Mineralienatlas )

Cleavages

{001} gut, {100} vollkommen, {010} vollkommen

Preface

Author (Name, Year)

Laihunite Research Group / China, 1976

References

American Mineralogist 62 (1977), 1058.

Mineralogical Journal (Tokyo) 11 (1983), 382.

Acta Crystallographica B42 (1986), 17.

American Mineralogist 71 (1986), 1455-1460.

Handbook of Mineralogy (Anthony u. w.), 2 (1995), 445.

Other languages

German

Laihunit

Spanish

Laihunita

English

Laihunite

French

Laihunite-1M

Russian

Лайхунит

Japanese

ライフー石

Japanese

ライフー石-1M

Alternative Name

Ferrifayalit

Ferrifayalita

Ferrifayalite

German

Laihunit-1M

Laihunita

English

Laihunite-1M

CNMNC symbol

Symbol

Lai

Locations with GPS information

IDs

GUSID (Global unique identifier short form) X811VH0pr0q97pijTQIQIw
GUID (Global unique identifier) 5475CD5F-297D-4AAF-BDEE-98A34D021023
Database ID 2117