Nepouite Mineral Data

General Nepouite Information

Chemical Formula:

Ni3Si2O5(OH)4

Composition:

Molecular Weight = 380.27 gm

Silicon 14.77 % Si 31.60 % SiO₂

Nickel 46.30 % Ni 58.92 % NiO

Hydrogen 1.06 % H 9.48 % H₂O

Oxygen 37.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni₃Si₂O₅(OH)₄

Environment:

Nickel-bearing laterite deposits.

IMA Status:

Valid Species (Pre-IMA) 1906

Locality:

Reis II mine, Nepoui, New Caledonia. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Nepouite

Synonym:

Genthite

Nepouite Image

Images:

Nepouite

Comments: Massive, green nÃ©pouite.
Location: Callenberg North (no. 2) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Specimen size 4 cm.
© Thomas Witzke / Abraxas-Verlag

Nepouite Crystallography

Axial Ratios:

a:b:c =0.5771:1:0.7902

Cell Dimensions:

a = 5.31, b = 9.2, c = 7.27, Z = 2; V = 355.15 Den(Calc)= 3.56

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Ccm21

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.31(1), 3.63(0.9), 2.501(0.7),1.53(0.6), 2.894(0.6), 4.55(0.5), 2.321(0.4),

Physical Properties of Nepouite

Cleavage:

{001} Good, {010} Good

Color:

Pale green, Deep green.

Density:

2.5 - 3.2, Average = 2.85

Diaphaneity:

Translucent to subtranslucent

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous - Pearly

Streak:

greenish white

Optical Properties of Nepouite

Gladstone-Dale:

CI meas= -0.094 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.124 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1766,KPDmeas= 0.2206,KC= 0.2017
Ncalc = 1.5 - 1.72

Optical Data:

Biaxial (-), a=1.6-1.63, g=1.635-1.65, bire=0.0200-0.0350, 2V(Meas)=0-10.

Pleochroism (z):

yellow green.

Calculated Properties of Nepouite

Electron Density:

Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Nepouite =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Nepouite= 18.77 barns/electron
U=PE_Nepouite x rElectron Density= 52.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nepouite is Not Radioactive

Nepouite Classification

Dana Class:

71.01.02b.03 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.01)with 1:1 layers

(71.01.02b)Serpentine group (Lizardite subgroup)

71.01.02b.01 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

71.01.02b.02 Lizardite Mg3Si2O5(OH)4 P1 1

71.01.02b.03 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

71.01.02b.04 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

Strunz Class:

09.ED.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.ED -Phyllosilicates with kaolinite layers

09.ED.15 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono

09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m

09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

09.ED.15 Maufite? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono

09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1

09.ED.15 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho

09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

09.ED.15 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho

Other Nepouite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Nepouite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Nepouite Specimen Label here :

Nepouite

Ni3Si2O5(OH)4
Dana No: 71.01.02b.03 Strunz No: 09.ED.15
Locality:

Notes:

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