Mbobomkulite Mineral Data

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General Mbobomkulite Information

Chemical Formula:

(Ni,Cu)Al4(NO3,SO4)2(OH)12•3(H2O)

Composition:

Molecular Weight = 567.00 gm

Aluminum 19.03 % Al 35.96 % Al₂O₃

Copper 2.80 % Cu 3.15 % Cu₂O

Nickel 7.76 % Ni 9.88 % NiO

Hydrogen 3.20 % H 28.60 % H₂O

Sulfur 2.83 % S 7.06 % SO₃

Nitrogen 3.71 % N 14.29 % N₂O₅

Oxygen 60.67 % O

______ ______

100.00 % 98.94 % = TOTAL OXIDE

Empirical Formula:

Ni_0.75Cu_0.25Al₄(NO₃)_1.5(SO₄)_0.5(OH)₁₂•3(H₂O)

Environment:

Friable nodules in allophane after rapid dehydration from hydrombobomkulite.

IMA Status:

Approved IMA 1980

Locality:

Mbobo Mkulu cave, Nelspruit district, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mbobomkulite + Pronunciation

Mbobomkulite Image

Images:

Mbobomkulite

Comments: White earthy mbobomkulite.
Location: Jomac Uranium mine, White Canyon, San Juan Co., Utah, USA. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

Mbobomkulite Crystallography

Axial Ratios:

a:b:c =1.1473:1:1.934

Cell Dimensions:

a = 10.171, b = 8.865, c = 17.145, Z = 4; beta = 95.37° V = 1,539.11 Den(Calc)= 2.45

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 8.55(1), 4.27(0.4), 7.87(0.15),

Physical Properties of Mbobomkulite

Cleavage:

{001} Perfect

Color:

Sky blue.

Density:

2.3

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Streak:

light blue

Optical Properties of Mbobomkulite

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2245,KPDmeas= 0.2391,KC= 0.2435
Ncalc = 1.56 - 1.6

Optical Data:

Biaxial (?), a=1.515, g=1.585, bire=0.0700

Calculated Properties of Mbobomkulite

Electron Density:

Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Mbobomkulite =2.30 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Mbobomkulite= 4.99 barns/electron
U=PE_Mbobomkulite x rElectron Density= 11.68 barns/cc.

Radioactivity:

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

Mbobomkulite Classification

Dana Class:

19.01.04.01 (19)Nitrates - Hydroxyl or Halogen

(19.01)with miscellaneous formulae

(19.01.04)Mbobomkulite Group

19.01.04.01 Mbobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12•3(H2O) P 2₁ 2

19.01.04.02 Hydrombobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12•14(H2O) Unk Mono

Strunz Class:

05.ND.10 05 - CARBONATES (NITRATES)

05.N - NITRATES

05.ND -With OH (etc.) and H2O

05.ND.10 Mbobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12•3(H2O) P 2₁ 2

Other Mbobomkulite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mbobomkulite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

Search for Mbobomkulite using:

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Ask about Mbobomkulite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Mbobomkulite

(Ni,Cu)Al4(NO3,SO4)2(OH)12•3(H2O)
Dana No: 19.01.04.01 Strunz No: 05.ND.10
Locality:

Notes: