Mbobomkulite Mineral Data

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:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Mbobomkulite :

A Bijoux Google Search for Mbobomkulite
Adam's Minerals Google Search for Mbobomkulite
Cape Minerals Google Search for Mbobomkulite
Dakota Matrix Minerals Google Search for Mbobomkulite
Excalibur Mineral Corp. Google Search for Mbobomkulite
Exceptional Minerals Google Search for Mbobomkulite
John Betts Fine Minerals Search for Mbobomkulite
McDougall Minerals Google Search for Mbobomkulite
Mineral News Website Link
Rock and Mineral Shows Google Search for Mbobomkulite
Weinrich Minerals, Inc. Google Search for Mbobomkulite

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: