Népouite (original) (raw)
A valid IMA mineral species - grandfathered
About NépouiteHide
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Colour:
Intense dark green to dull green.
Crystal System:
Orthorhombic
Name:
Named after type locality.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2882:6
31194374-557f-4f19-b4c4-ae09078d7d0f
IMA Classification of NépouiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
Classification of NépouiteHide
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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
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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.
| Symbol | Source | Reference |
|---|---|---|
| Npo | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Npo | Warr (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
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Transparency:
Translucent, Opaque
Colour:
Intense dark green to dull green.
Fracture:
Irregular/Uneven
Density:
3.24 g/cm3 (Measured) 3.26(13) g/cm3 (Calculated)
Optical Data of NépouiteHide
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RI values:
_n_α = 1.622 _n_β = 1.576 - 1.579 _n_γ = 1.635 - 1.650
δ = 0.013 - 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
X = dark green; Z = yellow-green
Chemistry of NépouiteHide
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Mindat Formula:
Ni3Si2O5(OH)4
Crystallography of NépouiteHide
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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)
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
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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
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Geological Setting:
alteration of ultramafic rocks
Type Occurrence of NépouiteHide
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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
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Other Language Names for NépouiteHide
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Relationship of Népouite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.ED. | Clinochrysotile | Mon. 2/m | |
|---|---|---|---|
| 9.ED.05 | Dickite | Al2(Si2O5)(OH)4 | Mon. m : B b |
| 9.ED.05 | Kaolinite | Al2(Si2O5)(OH)4 | Tric. 1 : _P_1 |
| 9.ED.05 | Nacrite | Al2(Si2O5)(OH)4 | Mon. m : B b |
| 9.ED.05 | Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 | Mon. m : B m |
| 9.ED.10 | Halloysite | Al2(Si2O5)(OH)4 | Mon. m : B b |
| 9.ED.10 | Hisingerite | Fe3+2(Si2O5)(OH)4 · 2H2O | Mon. |
| 9.ED.10 | Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O | Mon. m |
| 9.ED.15 | Amesite | Mg2Al(AlSiO5)(OH)4 | Tric. 1 : _P_1 |
| 9.ED.15 | Antigorite | Mg3(Si2O5)(OH)4 | Mon. m : B m |
| 9.ED.15 | Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 | Mon. m : B m |
| 9.ED.15 | Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 | Mon. |
| 9.ED.15 | Caryopilite | Mn2+3Si2O5(OH)4 | Mon. |
| 9.ED.15 | Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 | Trig. 3_m_ : P_31_m |
| 9.ED.15 | Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 | Mon. |
| 9.ED.15 | Greenalite | (Fe2+,Fe3+)2-3Si2O5(OH)4 | Mon. |
| 9.ED.15 | Kellyite | Mn2+2Al(AlSiO5)(OH)4 | Hex. 6 : _P_63 |
| 9.ED.15 | Lizardite | Mg3(Si2O5)(OH)4 | Trig. 3_m_ : P_31_m |
| 9.ED.15 | Manandonite | Li2Al4(Si2AlB)O10(OH)8 | Orth. 222 : _C_2221 |
| 9.ED.15 | Pecoraite | Ni3(Si2O5)(OH)4 | Mon. |
| 9.ED.15 | Guidottiite | Mn2Fe3+(Fe3+SiO5)(OH)4 | Hex. 6 : _P_63 |
| 9.ED.15 va | Chromoamesite | Mg2(Al,Cr)(AlSiO5)(OH)4 | |
| 9.ED.20 | Allophane | (Al2O3)(SiO2)1.3-2 · 2.5-3H2O | Amor. |
| 9.ED.20 | Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 | Orth. |
| 9.ED.20 | Imogolite | Al2SiO3(OH)4 | |
| 9.ED.20 | Neotocite | (Mn,Fe,Mg)SiO3 · H2O | Amor. |
| 9.ED.25 | Bismutoferrite | Fe3+2Bi(SiO4)2(OH) | Mon. m : B m |
| 9.ED.25 | Chapmanite | Fe3+2Sb3+(Si2O5)O3(OH) | Mon. m : B m |
| 9.ED.30 | Pianlinite | Al2Si2O6(OH)2 | Orth. |
Fluorescence of NépouiteHide
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Other InformationHide
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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
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References for NépouiteHide
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Localities for NépouiteHide
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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
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- 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.