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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
Member of:Olivine Group
Name:After the type locality, Laihe Fe deposit, near Laihe village, Qianshan District, Anshan Prefecture, Liaoning Province, 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 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:Olivine Group
Other Members of Group:

- +
Calcio-Olivine
Ca
 
2
SiO
 
4
Fayalite
Fe
2+
2
SiO
 
4
Forsterite
Mg
 
2
SiO
 
4
Glaucochroite
CaMn
2+
 
SiO
 
4
Kirschsteinite
CaFe
2+
 
SiO
 
4
Liebenbergite
(Ni,Mg)
 
2
SiO
 
4
Monticellite
CaMgSiO
 
4
Olivine
(Mg,Fe
2+
 
)
 
2
SiO
 
4
Tephroite
Mn
2+
2
SiO
 
4
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
CaMgSiO
 
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
FeSiO
 
3
14.19.4Ferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.19.5Ferripyrophyllite
Fe
3+
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

Polytypes for Laihunite

Polytypes:
Laihunite-2MLaihunite-3M

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).

Internet Links for Laihunite

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  • Raman and XRD data at RRUFF project
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  • Laihunite details from Handbook of Mineralogy (PDF)
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    • Localities for Laihunite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    China
     
    • Liaoning Province (Manchuria; Dongbei Region)
      • Anshan Prefecture
        • Qianshan District
    		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.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Châtelguyon
          • Charbonnières-les-Varennes
    		C. Lemanski, Jr. (re-entry of lost Mindat data).
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Mayen
          • Ettringen
            • Bellerberg volcano
    		Blass, G., Graf, H.W., Neufunde von bekannten Fundorten (14), Mineralien-Welt 6/4, 37, 1995
    Japan
     
    • Honshu Island
      • Chubu region
    		Knut Eldjarn collection
          • Atami City
    		Knut Eldjarn collection
      • Kanto Region
        • Kanagawa Prefecture
          • Yugawara
    Russia
     
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
    		Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
    USA
     
    • Colorado
      • El Paso Co.
        • Cheyenne District (St. Peters Dome District)
    		"Minerals of Colorado, updated & revised", p. 14, by Eckel, Edwin B., 1997
    [AmMin 84:196]
        • Crystal Park
    		Minerals of Colorado (1997) Eckels, E. B.
    • Oregon
      • Lane Co.
        • McKenzie Pass
          • North Sister Mountain
    		Microprobe Vol 9 #4, November 2001, Minerals of Obsidian Cliffs, McKenzie Pass, Lane Co, Oregon
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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