Mbobomkulite Mineral Data

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.

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

Optical Data:

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

Calculated Properties of Mbobomkulite

Electron Density:

r_electron=2.34 gm/cc
note: r_Mbobomkulite=2.30 gm/cc.

Fermion Index

Fermion Index = 0.0383
Boson Index = 0.9617

Photoelectric:

PE_Mbobomkulite= 4.99 barns/electron
U=PE_Mbobomkulite x r_electron= 11.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mbobomkulite is Not Radioactive

Mbobomkulite Classification

Dana Class:

19.1.4.1 (19)Nitrates - Hydroxyl or Halogen

(19.1)with miscellaneous formulae

(19.1.4)Dana Group

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

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

Strunz Class:

VI/D.08-70 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.08 - Spangolite - Glaucocerinite series

VI/D.08-05 Bechererite! (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3

VI/D.08-10 Spangolite Cu6Al(SO4)(OH)12Cl·3(H2O) P 3₁c 3m

VI/D.08-20 Cyanotrichite Cu4Al2(SO4)(OH)12·2(H2O) Unk Ortho

VI/D.08-30 Carbonate-cyanotrichite Cu4Al2(CO3,SO4)(OH)12·2(H2O) Unk Ortho

VI/D.08-35 Camerolaite Cu4Al2[HSbO4,SO4](OH)10(CO3)·2(H2O) P 2₁ ? 2

VI/D.08-40 Woodwardite Cu4Al2(SO4)(OH)12·2-4(H2O) Unk Hex

VI/D.08-42 Hydrowoodwardite! Cu1-xAlx(OH)2(SO4)x/2·n(H2O)with0<x<0.67andn>3x/2 R 3m 3 2/m

VI/D.08-45 Zincowoodwardite! [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n] P 3- or R 3m 3

VI/D.08-45* Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],x=0.33,n.0.96 P 3 3

VI/D.08-45** Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],0.32<x<0.50,n=0.59 R 3m 3 2/m

VI/D.08-50 Chalcoalumite CuAl4(SO4)(OH)12·3(H2O) P 2₁ 2

VI/D.08-60 Nickelalumite (Ni,Cu)Al4[(SO4),(NO3)2](OH)12·3(H2O) P 2₁ 2

VI/D.08-70 Mbobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12·3(H2O) P 2₁ 2

VI/D.08-80 Hydrombobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12·14(H2O) Unk Mono

VI/D.08-90 Carrboydite (Ni,Cu)14Al9(SO4,CO3)6(OH)43·7(H2O) Unk Hex

VI/D.08-100 Zincaluminite Zn6Al6(SO4)2(OH)26·5(H2O) Unk Hex

VI/D.08-110 Glaucocerinite (Zn,Cu)5Al3(SO4)1.5(OH)16·9(H2O) Unk (HEX-R) Trig

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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

Mbobomkulite

(Ni,Cu)Al4(NO3,SO4)2(OH)12·3(H2O)
Dana No: 19.1.4.1 Strunz No: VI/D.08-70
Locality:

Notes: