Nepouite Mineral Data

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.

Synonym:

Genthite

Nepouite Image

Images:

Nepouite

Comments: Massive, green n?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 - PyramidalH-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

Diaphaniety:

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

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:

r_electron=2.82 gm/cc
note: r_Nepouite=2.85 gm/cc.

Fermion Index

Fermion Index = 0.01231
Boson Index = 0.98769

Photoelectric:

PE_Nepouite= 18.77 barns/electron
U=PE_Nepouite x r_electron= 52.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nepouite is Not Radioactive

Nepouite Classification

Dana Class:

71.1.2b.3 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.2b)Serpentine group (Lizardite subgroup)

71.1.2b.1 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

71.1.2b.2 Lizardite Mg3Si2O5(OH)4 P1 1

71.1.2b.3 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

71.1.2b.4 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

Strunz Class:

VIII/H.27-150 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Nepouite Information

References:

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

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

Nepouite

Ni3Si2O5(OH)4
Dana No: 71.1.2b.3 Strunz No: VIII/H.27-150
Locality:

Notes: