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Népouite

A valid IMA mineral species - grandfathered
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About NépouiteHide

Formula:
Ni3Si2O5(OH)4
Colour:
Intense dark green to dull green.
Lustre:
Waxy
Hardness:
2 - 2½
Specific Gravity:
3.24
Crystal System:
Orthorhombic
Name:
Named after type locality.
Isostructural with:

Unique IdentifiersHide

Mindat ID:
2882
Long-form identifier:
mindat:1:1:2882:6
GUID
(UUID V4):
31194374-557f-4f19-b4c4-ae09078d7d0f

IMA Classification of NépouiteHide

Classification of NépouiteHide

9.ED.15

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

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
14.26.3

14 : Silicates not Containing Aluminum
26 : Silicates of Ni

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
NpoIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
NpoWarr (2020)Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of NépouiteHide

Transparency:
Translucent, Opaque
Colour:
Intense dark green to dull green.
Streak:
Greenish white
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Sectile
Cleavage:
Poor/Indistinct
Fracture:
Irregular/Uneven
Density:
3.24 g/cm3 (Measured)    3.26(13) g/cm3 (Calculated)

Optical Data of NépouiteHide

Type:
Biaxial (-)
RI values:
nα = 1.622 nβ = 1.576 - 1.579 nγ = 1.635 - 1.650
Birefringence:
0.027
Max Birefringence:
δ = 0.013 - 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v medium
Pleochroism:
Weak
Comments:
X = dark green; Z = yellow-green

Chemistry of NépouiteHide

Mindat Formula:
Ni3Si2O5(OH)4

Crystallography of NépouiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.29(2) Å, b = 9.17(3) Å, c = 7.26(2) Å
Ratio:
a:b:c = 0.577 : 1 : 0.792
Unit Cell V:
352.18 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Rarely as crude pseudohexagonal vermiform crystals, to 1 cm, usually massive.
Comment:
Probably orthorhombic. Point Group: n.d.; Space Group: n.d.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.31 Å(100)
4.55 Å(50b)
3.63 Å(90)
2.894 Å(60)
2.501 Å(70)
2.321 Å(40)
1.530 Å(60)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 5: Initiation of plate tectonics<3.5-2.5
38 : Ophiolites
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
Geological Setting:
alteration of ultramafic rocks

Type Occurrence of NépouiteHide

Geological Setting of Type Material:
Alteration product of nickel-rich ultramafic rocks.
Associated Minerals at Type Locality:
Reference:
Glasser, M.E. (1907) Note sur une espèce minérale nouvelle, la népouite, silicate hydraté de nickel et de magnésie. Bulletin de la Société Française de Minéralogie: 30: 17-28.

Synonyms of NépouiteHide

Other Language Names for NépouiteHide

German:Népouit
Simplified Chinese:镍绿泥石
Spanish:Népouita

Relationship of Népouite to other SpeciesHide

Other Members of this group:
AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
CaryopiliteMn2+3Si2O5(OH)4Mon.
ChrysotileMg3(Si2O5)(OH)4Mon. m : Bb
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 : P63
KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 : P63
LizarditeMg3(Si2O5)(OH)4Trig. 3m : P3 1m
PecoraiteNi3(Si2O5)(OH)4Mon.
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Népouite associated with TrevoriteNi2+Fe3+2O4
3 photos of Népouite associated with JaipuriteCoS
3 photos of Népouite associated with MaucheriteNi11As8
3 photos of Népouite associated with MilleriteNiS
3 photos of Népouite associated with JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2O
3 photos of Népouite associated with Goethiteα-Fe3+O(OH)
3 photos of Népouite associated with Serpentine SubgroupD3[Si2O5](OH)4
2 photos of Népouite associated with QuartzSiO2
2 photos of Népouite associated with VaesiteNiS2
2 photos of Népouite associated with UraniniteUO2

Related Minerals - Strunz-mindat GroupingHide

9.ED.ClinochrysotileMon. 2/m
9.ED.05DickiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05KaoliniteAl2(Si2O5)(OH)4Tric. 1 : P1
9.ED.05NacriteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4Mon. m : Bm
9.ED.10HalloysiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.10HisingeriteFe3+2(Si2O5)(OH)4 · 2H2OMon.
9.ED.10HydrohalloysiteAl2Si2O5(OH)4 · 2H2OMon. m
9.ED.15AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
9.ED.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
9.ED.15CaryopiliteMn2+3Si2O5(OH)4Mon.
9.ED.15CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
9.ED.15Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4Mon.
9.ED.15KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 : P63
9.ED.15LizarditeMg3(Si2O5)(OH)4Trig. 3m : P3 1m
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth. 2 2 2 : C2 2 21
9.ED.15PecoraiteNi3(Si2O5)(OH)4Mon.
9.ED.15GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 : P63
9.ED.15 vaChromoamesiteMg2(Al,Cr)(AlSiO5)(OH)4
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2OAmor.
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1Orth.
9.ED.20ImogoliteAl2SiO3(OH)4
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
9.ED.25BismutoferriteFe3+2Bi(SiO4)2(OH)Mon. m : Bm
9.ED.25ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon. m : Bm
9.ED.30PianliniteAl2Si2O6(OH)2Orth.

Fluorescence of NépouiteHide

Not fluorescent in UV

Other InformationHide

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

Internet Links for NépouiteHide

References for NépouiteHide

Localities for NépouiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Albania
 
  • Korçë County
    • Devoll
Thorne et al. (2012)
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
RRUFF Project Specimen ID: R050268
  • Western Australia
    • Coolgardie Shire
      • Kambalda
        • Kambalda Nickel mines
          • Juan complex
Nickel et al. (1977)
      • Widgiemooltha
Nickel et al. (1993) +1 other reference
    • Leonora Shire
      • Eulaminna (Murrin Murrin mining centre)
Sue Koepke collection via Jiri Just
    • Wiluna Shire
      • Mount Keith
Grguric (2003)
Austria
 
  • Carinthia
    • Spittal an der Drau District
      • Gmünd in Kärnten
Niedermayr et al. (1995)
      • Trebesing
        • Radlgraben
Niedermayr et al. (1995)
Burundi
 
  • Rutana Province
The Royal Museum for Central Africa (RMCA) +1 other reference
Canada
 
  • Newfoundland and Labrador
    • Newfoundland
      • Baie Verte Peninsula
Escayola et al. (2011)
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
        • Cobalt area
          • Coleman Township
            • Nipissing 404
Reiner Mielke 2017
China
 
  • Tibet
    • Shannan Prefecture (Lhokha Prefecture; Lhoka Prefecture)
      • Qusum Co. (Qusong Co.)
Wang et al. (2023)
  • Yunnan
    • Wenshan
      • Malipo County
Kaiji Yu (1981)
Czech Republic
 
  • South Moravian Region
    • Blansko District
  • Vysočina Region
    • Žďár nad Sázavou District
Pelíšek
Dominican Republic
 
  • Monseñor Nouel Province
    • Bonao
Villanova-de-Benavent et al. (2014)
Rob Lavinsky
DR Congo
 
  • Haut-Katanga
    • Kambove Territory
      • Shinkolobwe
Gauthier et al. (1989)
France
 
Brindley (1975)
    • Northern Province
      • Canala
Dana 6:A2:75. +1 other reference
      • Houaïlou
Berger +1 other reference
      • Koua River
Dana 6:A2:75. +1 other reference
      • Kouaoua
Dana 6:A2:75. +1 other reference
      • Pouembout
C.R.Acad.Sci.Paris (1906) +1 other reference
      • Poya North
        • Népoui
Dana 6:A2:75. +1 other reference
    • Southern Province
      • Comboui River
Dana 6:A2:75. +1 other reference
Mineralogical Society of America - ...
      • Yaté
Wells +7 other references
Germany
 
  • Bavaria
    • Lower Franconia
      • Haßberge District
        • Maroldsweisach
Wittern (2001)
  • Saxony
    • Zwickau District
      • Callenberg
XRD and SEM-EDX analysis (T. Witzke)
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion Mining District
          • Km 3
            • Km 3 mines
Indonesia
 
  • Central Sulawesi Province
    • North Morowali Regency
      • Petasia
Wei Fu et al. (2010)
  • Maluku Province
Taixu Luo (2008)
Italy
 
  • Piedmont
    • Cuneo Province
      • Crissolo
        • Pian Melzé (Pian della Regina)
Piccoli (2002) +1 other reference
    • Metropolitan City of Turin
Piccoli et al. (2007)
Gennaro (1931) +2 other references
      • Roure
Piccoli G.C. et al. (2007)
      • Rubiana
Piccoli et al. (2007)
    • Verbano-Cusio-Ossola Province
      • Valstrona
        • Campello Monti
Ciriotti et al. (2023) +1 other reference
  • Sardinia
    • South Sardinia Province
      • Nuxis
        • Monte Tamara mining area
Lecca G.C. et al. (2022)
Japan
 
  • Fukushima Prefecture
    • Koriyama City
Matsubara (1996)
  • Mie Prefecture
    • Toba City
Go Ito +1 other reference
Kazakhstan
 
  • Aktobe Region
    • Kargaly District
Pavel M. Kartashov analytical data 2019
Morocco
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
          • Aït Ahmane
Favreau et al. (2006)
North Macedonia
 
  • Veles Municipality
Spasovski et al. (2009)
Spasovski et al. (2009)
Norway
 
  • Telemark
    • Porsgrunn
      • Auenlandet
Engvoldsen et al. (1991) +1 other reference
Poland
 
  • Lower Silesian Voivodeship
    • Ząbkowice Śląskie County
      • Gmina Ząbkowice Śląskie
Spangenberg et al. (1949)
Spangenberg et al. (1949)
Portugal
 
  • Aveiro
    • Albergaria-a-Velha
      • Branca
Marques de Sá et al. (2010)
Russia
 
  • Chelyabinsk Oblast
    • Verkhny Ufaley
      • Ufaley District (Ufalei District)
Berger +2 other references
  • Sverdlovsk Oblast
    • Serovsky District
      • Serov
        • Kola massif
Mikhailov (2000)
South Africa
 
  • Limpopo
    • Vhembe District Municipality
      • Musina Local Municipality
Cairncross et al. (1995)
  • Mpumalanga
    • Ehlanzeni District Municipality
      • Mbombela Local Municipality
        • Barberton
De Waal et al. (1974) +2 other references
South Korea
 
  • Gyeonggi Province
    • Gwacheon City
Song et al. (1995)
Spain
 
  • Andalusia
    • Málaga
      • Álora
Romero Silva (2003)
      • Carratraca
        • Los Jarales
Romero Silva JC (2003)
Romero Silva JC (2003)
      • Estepona
Romero Silva (2003)
      • Ojén
        • Ojén lherzolite massif
Calvo (2018)
      • Ronda Massif
Romero Silva (2003)
  • Catalonia
    • Tarragona
      • Priorat
        • Falset
Joan Abella i Creus specimens +1 other reference
USA
 
  • California
    • Del Norte County
      • Klamath Mountains
        • Diamond Creek Mining District
          • Rockland
Van Nostrand Reinholt Press: 422. +2 other references
        • Gasquet
Van Nostrand Reinholt Press: 422. +1 other reference
        • Rocky Saddle
Van Nostrand Reinholt Press: 422. +1 other reference
    • El Dorado County
      • Salmon Falls Mining District (Flagstaff Hill area)
        • Flagstaff Hill
Van Nostrand Reinholt Press: 422. +3 other references
Montoya (1963)
    • Imperial County
      • Coyote Mountains
        • Carrizo Mountain
Pemberton (1983)
      • Plaster City
Van Nostrand Reinholt Press: 422. +2 other references
    • Mariposa County
      • Bagby-Mariposa-Mount Bullion-Whitlock Mining District
        • Bagby
          • Pacific Mining Co. group
Van Nostrand Reinholt Press: 422. +2 other references
    • San Benito County
      • Idria Peak
Van Nostrand Reinholt Press: 423. +3 other references
    • Santa Cruz County
      • Santa Cruz
Mineralogical Record: 17:315
    • Tulare County
      • Ivanhoe
        • Venice Hills
Van Nostrand Reinholt Press: 424. +2 other references
  • New Mexico
    • Luna County
      • Victorio Mountains
Excalibur Mineral Corporation - Rare ...
  • North Carolina
Genth
    • Jackson County
      • Webster-Balsam
Conley (1958)
    • Macon County
      • Cowee Valley
        • Ellijay Mining District
          • Franklin
            • Corundum Hill
Genth
 
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