Nimite Mineral Data

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.

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 - PrismaticH-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

Diaphaniety:

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= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2024,KPDmeas= 0.2005,KC= 0.2101

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:

r_electron=3.16 gm/cc
note: r_Nimite=3.18 gm/cc.

Fermion Index

Fermion Index = 0.01613
Boson Index = 0.98387

Photoelectric:

PE_Nimite= 11.55 barns/electron
U=PE_Nimite x r_electron= 36.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nimite is Not Radioactive

Nimite Classification

Dana Class:

71.4.1.5 (71)Phyllosilicate Sheets of Six-Membered Rings

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

(71.4.1)Chlorite group (Tri-Dioctahedral)

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

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

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

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

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

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

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

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

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

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

Strunz Class:

VIII/H.23-70 VIII - Silicates

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

VIII/H.23 - Chlorite group

VIII/H.23-10 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

VIII/H.23-20 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-30 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

VIII/H.23-40 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

VIII/H.23-50 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

VIII/H.23-60 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-70 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-80 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

VIII/H.23-90 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

VIII/H.23-95 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

VIII/H.23-100 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

VIII/H.23-110 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

Other Nimite Information

References:

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

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Nimite

(Ni,Mg,Fe++)5Al(Si3Al)O10(OH)8
Dana No: 71.4.1.5 Strunz No: VIII/H.23-70
Locality:

Notes: