Ernienickelite Mineral Data

Ernienickelite Mineral Data +

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General Ernienickelite Information

Chemical Formula:

NiMn++++3O7·3(H2O)

Composition:

Molecular Weight = 389.55 gm

Manganese 42.31 % Mn 66.95 % MnO₂

Nickel 15.07 % Ni 19.17 % NiO

Hydrogen 1.55 % H 13.87 % H₂O

Oxygen 41.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NiMn⁴⁺₃O₇·3(H₂O)

Environment:

Cavities in chalcedony in a laterized dunite.

IMA Status:

Approved IMA 1994

Locality:

SM7 open pit N of Siberia, Kalgoorlie district, WA, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Ernest (Ernie) Henry Nickel (1925-), Canadian-Australian mineralogist, Commonwealth Scientific and Industrial Research Organization (CISRO) and International Mineralogical Association (IMA).

Synonym:

IMA1993-002

Ernienickelite Image

Images:

Ernienickelite

Comments: Very small reddish-black tabular crystals of ernienickelite on quartz.
Location: Siberia complex, Western Australia, Australia. Scale: Picture size 0.7 mm.
© Thomas Witzke / Abraxas-Verlag

Ernienickelite Crystallography

Axial Ratios:

a:c = 1:2.7309

Cell Dimensions:

a = 7.514, c = 20.52, Z = 6; V = 1,003.35 Den(Calc)= 3.87

Crystal System:

TrigonalSpace Group: R 3 or R 3

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

By Intensity(I/I_o): 6.84(1), 2.219(0.3), 4.01(0.2),

Physical Properties of Ernienickelite

Cleavage:

[0001] Perfect

Color:

Reddish black.

Density:

3.84

Diaphaniety:

Subtranslucent to Opaque

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

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

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

2 - Gypsum

Luster:

Sub Metallic

Streak:

yellowish brown

Optical Properties of Ernienickelite

Gladstone-Dale:

CI meas= 0.256 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.262 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2545,KPDmeas= 0.2565,KC= 0.3447

Optical Data:

Uniaxial (-), e=1.97, w=2, bire=0.0300.

Calculated Properties of Ernienickelite

Electron Density:

r_electron=3.73 gm/cc
note: r_{Ernienickelite}=3.84 gm/cc.

Fermion Index

Fermion Index = 0.0019
Boson Index = 0.9981

Photoelectric:

PE_{Ernienickelite}= 16.89 barns/electron
U=PE_{Ernienickelite} x r_electron= 62.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ernienickelite is Not Radioactive

Ernienickelite Classification

Dana Class:

7.8.2.4 (7)Multiple Oxides

(7.8)where A B (O)2·x(H2O)

(7.8.2)Dana Group

7.8.2.1 Chalcophanite (Zn,Fe,Mn)Mn3O7·3(H2O) R 3 3

7.8.2.2 Aurorite (Mn,Ag,Ca)Mn3O7·3(H2O) P1 1

7.8.2.3 Jianshuiite (Mg,Mn)Mn3O7·3(H2O) R 3 or R 3 Trig

7.8.2.4 Ernienickelite NiMn3O7·3(H2O) R 3 or R 3 Trig

Strunz Class:

IV/F.11-15 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.11 - Jiansuiite - Birnessite series

IV/F.11-05 Jianshuiite (Mg,Mn)Mn3O7·3(H2O) R 3 or R 3 Trig

IV/F.11-10 Aurorite (Mn,Ag,Ca)Mn3O7·3(H2O) P1 1

IV/F.11-15 Ernienickelite NiMn3O7·3(H2O) R 3 or R 3 Trig

IV/F.11-20 Chalcophanite (Zn,Fe,Mn)Mn3O7·3(H2O) R 3 3

IV/F.11-25 Cianciulliite Mn(Mg,Mn)2Zn2(OH)10·2-4(H2O) C 2/m 2/m

IV/F.11-30 Birnessite (Na,Ca,K)x(Mn,Mn)2O4·1.5(H2O) C 2/m 2/m

Other Ernienickelite Information

References:

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

See Also:

Links to other databases for Ernienickelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Ernienickelite

NiMn++++3O7·3(H2O)
Dana No: 7.8.2.4 Strunz No: IV/F.11-15
Locality:

Notes: