Nimite Mineral Data

General Nimite Information

Chemical Formula:

(Ni,Mg,Fe++)5Al(Si3Al)O10(OH)8

Composition:

Molecular Weight = 666.98 gm

Magnesium 6.19 % Mg 10.27 % MgO

Aluminum 8.09 % Al 15.29 % Al₂O₃

Iron 5.86 % Fe 3.23 % FeO / 4.79 % Fe₂O₃

Silicon 12.63 % Si 27.03 % SiO₂

Nickel 22.88 % Ni 29.12 % NiO

Hydrogen 1.16 % H 10.40 % H₂O

Oxygen 43.18 % O

______ ______

100.00 % 100.12 % = TOTAL OXIDE

Empirical Formula:

Ni_2.6Mg_1.7AlFe³⁺_0.4Fe²⁺_0.3Si₃AlO_10.3(OH)_7.7

Environment:

In a small tabular body of nickeliferous serpentinite, probably a contact deposit, along the junction of quartzite and an ultramafic intrusive.

IMA Status:

Approved IMA 1968

Locality:

From three km west of the Scotia talc mine, Bon Accord area, Barberton, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

An acronym for the National Institute of Metallurgy of South Africa.

Name Pronunciation:

Nimite

Nimite Image

Images:

Nimite

Comments: Dark green nimite aggregates on white calcite.
Location: Planalto, Rio Grande do Sol, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nimite Crystallography

Axial Ratios:

a:b:c =0.5773:1:1.5522

Cell Dimensions:

a = 5.32, b = 9.214, c = 14.302, Z = 2; beta = 97.1° V = 695.69 Den(Calc)= 3.18

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 7.1(1), 3.55(0.45), 14.2(0.25),

Physical Properties of Nimite

Cleavage:

{001} Distinct

Color:

Yellow green.

Density:

3.19 - 3.23, Average = 3.21

Diaphaneity:

Transparent to Translucent

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

3 - Calcite

Luster:

Pearly

Streak:

white

Optical Properties of Nimite

Gladstone-Dale:

CI meas= 0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2024,KPDmeas= 0.2005,KC= 0.2162
Ncalc = 1.69 - 1.7

Optical Data:

Biaxial (-), a=1.637, b=1.647, g=1.647, bire=0.0100, 2V(Calc)=0, 2V(Meas)=15.

Pleochroism (x):

yellow green.

Pleochroism (y):

apple green.

Pleochroism (z):

apple green.

Calculated Properties of Nimite

Electron Density:

Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Nimite =3.18 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Nimite= 11.55 barns/electron
U=PE_Nimite x rElectron Density= 36.48 barns/cc.

Radioactivity:

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

Nimite Classification

Dana Class:

71.04.01.05 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.01)Chlorite group (Tri-Dioctahedral)

71.04.01.01 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

71.04.01.02 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

71.04.01.03 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

71.04.01.04 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.05 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.06 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

71.04.01.07 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

71.04.01.08 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.09 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

71.04.01.10 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Strunz Class:

09.EC.55 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.55 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

09.EC.55 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

09.EC.55 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

09.EC.55 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

09.EC.55 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

09.EC.55 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

09.EC.55 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m

09.EC.55 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

09.EC.55 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

09.EC.55 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1

09.EC.55 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Other Nimite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Nimite :
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 Nimite Specimen Label here :

Nimite

(Ni,Mg,Fe++)5Al(Si3Al)O10(OH)8
Dana No: 71.04.01.05 Strunz No: 09.EC.55
Locality:

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