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Népouite

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Callenberg North (No. 2) open cut, Callenberg, Glauchau, Saxony, Germany
© Thomas Witzke

Show Népouite Photos (2)
Formula:
(Ni,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
System:OrthorhombicColour:Pale green
Hardness:2 - 2½
Name:Named after type locality


Lizardite-Nepouite Series.

Classification of Népouite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/H.27-150
Nickel-Strunz 10th (pending) edition ID:9.ED.15

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
Dana 8th edition ID:71.1.2b.3

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
Hey's CIM Ref.:14.26.3

14 : Silicates not Containing Aluminum
26 : Silicates of Ni
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Type Occurrence of Népouite

Type Locality:Népoui Mine, Népoui, Nouméa Commune, Northern Province, New Caledonia

Physical Properties of Népouite

Lustre:Vitreous, Pearly
Colour:Pale green
Streak:Greenish white
Hardness (Mohs):2 - 2½

Crystallography of Népouite

Crystal System:Orthorhombic

Optical Data of Népouite

Type:Biaxial (-)
RI values: nα = 1.600 - 1.630 nγ = 1.635 - 1.650
Maximum Birefringence:δ = 0.035

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v medium

Chemical Properties of Népouite

Formula:
(Ni,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
Essential elements:H, Ni, O, Si
All elements listed in formula:H, Mg, Ni, O, Si

Relationship of Népouite to other Species

Series:Forms a series with Lizardite (see here)
Member of:Serpentine Group
Related Minerals - Nickel-Strunz Grouping):
9.ED.05Dickite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Kaolinite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Nacrite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
(Si,Al)
 
2
O
 
5
(OH)
 
4
9.ED.10Halloysite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.10Hisingerite
Fe
3+
2
Si
 
2
O
 
5
(OH)
 
4
·2H
 
2
O
9.ED.10Halloysite-7Å
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.10Halloysite-10Å
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
·2H
 
2
O
9.ED.15Amesite
Mg
 
2
Al[(OH)
 
4
|AlSiO
 
5
]
9.ED.15Antigorite
(Mg,Fe
2+
 
)
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.15Berthierine
(Fe,Fe,Mg)
 
2-3
(Si,Al)
 
2
O
 
5
(OH)
 
4
9.ED.15Brindleyite
(Ni,Mg,Fe)
 
2
Al(Si,Al)O
 
5
(OH)
 
4
9.ED.15Caryopilite
(Mn,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Chrysotile
Mg
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Cronstedtite
Fe
2+
2
Fe
3+
 
[(Si,Fe
3+
 
)
 
2
O
 
5
](OH)
 
4
9.ED.15Fraipontite
(Zn,Al)
 
3
[(OH)
 
4
|(Si,Al)
 
2
O
 
5
]
9.ED.15Greenalite
Fe
 
2-3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Kellyite
Mn
2+
2
Al[(OH)
 
4
|AlSiO
 
5
]
9.ED.15Lizardite
Mg
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.15Manandonite
LiAl
 
4
Si
 
3
BO
 
10
(OH)
 
6
9.ED.15Pecoraite
Ni
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.20Allophane
(Al
 
2
O
 
3
)(SiO
 
2
)
 
1.3-2
·2.5-3H
 
2
O
9.ED.20Chrysocolla
(Cu,Al)
 
2
H
 
2
Si
 
2
O
 
5
(OH)
 
4
·nH
 
2
O
9.ED.20Imogolite
Al
 
2
SiO
 
3
(OH)
 
4
9.ED.20Neotocite
(Mn,Fe,Mg)SiO
 
3
·H
 
2
O
9.ED.25Bismutoferrite
Fe
3+
2
Bi[OH|(SiO
 
4
)
 
2
]
9.ED.25Chapmanite
Fe
3+
2
Sb
3+
 
[OH|(SiO
 
4
)
 
2
]
Related Minerals - Hey's Index Grouping:
14.26.1Liebenbergite
(Ni,Mg)
 
2
[SiO
 
4
]
14.26.2Pecoraite
Ni
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
14.26.4Willemseite
(Ni,Mg)
 
3
Si
 
4
O
 
10
(OH)
 
2
14.26.5Karpinskite
(Ni,Mg)
 
2
Si
 
2
O
 
5
(OH)
 
2
14.26.6Falcondoite
(Ni,Mg)
 
4
Si
 
6
O
 
15
(OH)
 
2
·6H
 
2
O

Other Names for Népouite

Synonyms:
Lizardite-Ni
German names:
Népouit
Spanish names:
Népouita

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 Népouite

Reference List:American Mineralogist (1975): 60: 863-871.

Mineralogical Magazine (1981): 44: 153.

Articles/Blogs about Népouite

Internet Links for Népouite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Népouite in the Natural History Museum (London) online catalogue
  • Népouite details from Handbook of Mineralogy (PDF)
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    Localities for Népouite

    Hide Locality List
    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.
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    (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.
    Australia
     
    • Western Australia
      • Widgiemooltha
    		No reference listed
    Austria
     
    • Carinthia
      • Hohe Tauern Mts
        • Reißeck group
          • Gmünd
    		G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
            • Radlgraben
    		G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • South Moravia Region
    		No reference listed
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Central area
          • Shinkolobwe
    		MinRec 20:287-288
    Germany
     
    • Bavaria
      • Franconia
        • Maroldsweisach
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Saxony
      • Glauchau
        • Callenberg
    		XRD and SEM-EDX analysis (T. Witzke)
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Lavrion (Laurion; Laurium)
            • Lavrion Mines
    		No reference listed
    Italy
     
    • Piedmont
      • Cuneo Province
        • Po Valley
          • Crissolo
            • Pian Melzé (Pian della Regina)
    		Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    Japan
     
    • Honshu Island
      • Kinki region
        • Mie Prefecture
          • Toba City
    		Minakawa et al (1989) Sanko-Gakkai Kou'en-Youshi, 27.
      • Tohoku Region
        • Fukushima Prefecture
    		Matsubara (1996) Memoirs of the National Science Museum, 29, 33-40.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
            • Aït Ahmane
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    New Caledonia
     
    • Comboui River
    		Dana 6:A2:75.
    • Kua River
    		Dana 6:A2:75.
    • Northern Province
      • Canala Commune
    		Dana 6:A2:75.
      • Kouaoua
    		Dana 6:A2:75.
      • Nouméa Commune
        • Népoui
    		C.R.Acad.Sci.Paris (1906) 143, 1173; Bull.Soc.fr.Min.(1907) 30, 17-28
    Dana 6:A2:75.
    • Southern Province
    South Africa
     
    • Limpopo Province
      • Mabilikewe Hill
    		Minerals of South Africa
    • Mpumalanga Province
      • Barberton District
        • Bon Accord
    		Am. Min. 61, 502 (1976)
    USA
     
    • California
      • Santa Cruz Co.
        • Santa Cruz
    		Mineralogical Record: 17:315
    • New Mexico
      • Luna Co.
    Leonard S.Wiener and Sigrid Ballew,1995, Updated by Kenny Gay,2006, A Listing Of North Carolina Minerals,Geologic Note No.4
    Genth,F.A,1891,The Minerals of North Carolina,pg.63 and pg.88
      • Jackson Co.
        • Webster- Balsam
    		Conley,J.F,1958,Mineral Localities of North Carolina,pg 39,32,64
      • Macon Co.
        • Cowee Valley
          • Ellijay District
            • Franklin
              • Corundum Hill
    		Genth,F.A,1891,The Minerals of North Carolina,pg63 and pg.103
    Mineral and/or Locality
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