Mineralogy Database

Mbobomkulite Mineral Data

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General Mbobomkulite Information

Help on Chemical  Formula: Chemical Formula: (Ni,Cu)Al4(NO3,SO4)2(OH)12•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ni0.75Cu0.25Al4(NO3)1.5(SO4)0.5(OH)12•3(H2O)
Help on Environment: Environment: Friable nodules in allophane after rapid dehydration from hydrombobomkulite.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Mbobo Mkulu cave, Nelspruit district, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Mbobomkulite + Pronunciation Say MBOBOMKULITE

Mbobomkulite Image

Click Here for Larger   Image in a New Browser Window Images:
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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.1473:1:1.934
Help on Cell Dimensions: Cell Dimensions: a = 10.171, b = 8.865, c = 17.145, Z = 4; beta = 95.37° V = 1,539.11 Den(Calc)= 2.45
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.55(1), 4.27(0.4), 7.87(0.15),

Physical Properties of Mbobomkulite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Sky blue.
Help on Density: Density: 2.3
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Powdery - Forms a loose, poorly-coherent pulverulent mass.
Help on Streak: Streak: light blue

Optical Properties of Mbobomkulite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=1.515, g=1.585, bire=0.0700

Calculated Properties of Mbobomkulite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Mbobomkulite =2.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEMbobomkulite = 4.99 barns/electron
U=PEMbobomkulite x rElectron Density= 11.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mbobomkulite is Not Radioactive

Mbobomkulite Classification

Help on  Dana Class: Dana Class: (19)Nitrates - Hydroxyl or Halogen
  (19.01)with miscellaneous formulae
  (19.01.04)Mbobomkulite Group Mbobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12•3(H2O) P 21 2 Hydrombobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12•14(H2O) Unk Mono
Help on  Strunz Class: Strunz Class: 05.ND.10 05 - CARBONATES (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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 05.ND.10





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