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Népouite

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

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


Lizardite-Népouite 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
X-Ray Powder Diffraction:
d-spacingIntensity
7.31 (100)
4.55 (50b)
3.63 (90)
2.894 (60)
2.501 (70)
2.321 (40)

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.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
Other Languages:
German:Népouit
Spanish: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.

Internet Links for Népouite

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    Localities for Népouite

    Show Locality List (41 Items)
    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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