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Laihunite

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Obsidian Cliffs, North Sister Mountain, McKenzie Pass, Lane Co., Oregon, USA
© Bill Lechner

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Formula:
Fe
2+
 
Fe
3+
2
[SiO
 
4
]
 
2
System:MonoclinicColour:Dark brown
Hardness:6
Name:After the type locality, Laihe Fe deposit, near Laihe village, Qianshan District, Anshan City, Anshan Prefecture, Liaoning Province (Manchuria), China.


Olivine Group.
Corresponds to a strongly oxidised, vacancy-bearing fayalite.

Classification of Laihunite

IMA status:Approved
Strunz 8th edition ID:8/A.04-50
Nickel-Strunz 10th (pending) edition ID:9.AC.05

9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination
Dana 8th edition ID:51.3.1.5

51 : NESOSILICATES Insular SiO4 Groups Only
3 : Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Hey's CIM Ref.:14.19.3

14 : Silicates not Containing Aluminum
19 : Silicates of Fe
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Type Occurrence of Laihunite

Type Locality:Laihe Fe deposit, Qianshan District, Anshan City, Anshan Prefecture, Liaoning Province (Manchuria; Dongbei Region), China
Year of Discovery:1976

Physical Properties of Laihunite

Colour:Dark brown
Streak:Brown, light
Hardness (Mohs):6

Crystallography of Laihunite

Crystal System:Monoclinic
Cell Parameters:a = 4.8Å, b = 10.18Å, c = 5.8Å
β = 90°
Ratio:a:b:c = 0.472 : 1 : 0.57
Unit Cell Volume:V 283.41 ų (Calculated from Unit Cell)

Chemical Properties of Laihunite

Formula:
Fe
2+
 
Fe
3+
2
[SiO
 
4
]
 
2
Essential elements:Fe, O, Si
All elements listed in formula:Fe, O, Si
Common Impurities:Mg,Ca

Relationship of Laihunite to other Species

Member of Group:
Olivine Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.AC.05Fayalite
Fe
2+
2
[SiO
 
4
]
9.AC.05Forsterite
Mg
 
2
[SiO
 
4
]
9.AC.05Glaucochroite
CaMn
2+
 
[SiO
 
4
]
9.AC.05Kirschsteinite
CaFe
2+
 
[SiO
 
4
]
9.AC.05Liebenbergite
(Ni,Mg)
 
2
[SiO
 
4
]
9.AC.05Tephroite
Mn
2+
2
[SiO
 
4
]
9.AC.10Monticellite
CaMg[SiO
 
4
]
9.AC.15Ringwoodite
(Mg,Fe
2+
 
)
 
2
[SiO
 
4
]
9.AC.20Chesnokovite
Na
 
2
[SiO
 
2
(OH)
 
2
] · 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.19.1Fayalite
Fe
2+
2
[SiO
 
4
]
14.19.2Ferrosilite
Fe
 
2
[SiO
 
3
]
 
2
14.19.4Ferro-anthophyllite
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
14.19.5Ferripyrophyllite
Fe
 
2
Si
 
4
O
 
10
(OH)
 
2
14.19.6Greenalite
Fe
 
2-3
Si
 
2
O
 
5
(OH)
 
4
14.19.7Cronstedtite
Fe
2+
2
Fe
3+
 
[(Si,Fe
3+
 
)
 
2
O
 
5
](OH)
 
4
14.19.8Hisingerite
Fe
3+
2
Si
 
2
O
 
5
(OH)
 
4
·2H
 
2
O

Other Names for Laihunite

Synonyms:
Ferrifayalite
Other Languages:
German:Ferrifayalit
Laihunit
Russian:Лайхунит
Spanish:Ferrifayalita
Laihunita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Laihunite

Reference List:Laihunite Research Group, Guiyang Institute of Geochemistry, Academia Sinica and 101 Geological Team of Liaoning, Metallurgical and Geological Prospecting Company (1976): Laihunite - a new iron silicate mineral. Geochimica 1976(2), 95-103 (in Chinese with English abstract). - American Mineralogist (1977), 62, 1058 (abstract).

X-ray Laboratory, Guiyang Institute of Geochemistry, Academica Sinica (1976): The crystal structure of laihunite. Geochimica 1976(2), 104-6 (in Chinese with English abstract).

Shen Buming, Osamu Tamada, Masao Kitamura, and Nobuo Morimoto (1982): Superstructure of laihunite Fe(2+)0.5Fe(3+)1.0SiO4. Scientia Geologica Sinica 1982(3), 341-42 (in Chinese with English abstract).

Zou Bensan and Guo Kexin (1986): HREM study of Laihenite. Acta Mineralogica Sinica 6(3), 217-19 (in Chinese with English abstract).- American Mineralogist (1986), 71, 1455-1460 (abstract).

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    Localities for Laihunite

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