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Mbobomkulite

Big Photo

Jomac Mine, White Canyon, White Canyon District, San Juan Co., Utah, USA
© Thomas Witzke

Show Mbobomkulite Photos (4)
Formula:
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 3H
 
2
O
System:Monoclinic


Chalcoalumite Group.

See also hydrombobomkulite.

Classification of Mbobomkulite

IMA status:Approved 1979
Strunz 8th edition ID:6/D.08-70
Nickel-Strunz 10th (pending) edition ID:5.ND.10

5 : CARBONATES (NITRATES)
N : NITRATES
D : With OH (etc.) and H2O
Dana 7th edition ID:19.2.4.1
Dana 8th edition ID:19.1.4.1

19 : NITRATES CONTAINING HYDROXYL OR HALOGEN
1 : Anhydrous Nitrates Containing Hydroxyl or Halogen
Hey's CIM Ref.:13.11

13 : Nitrates
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Type Occurrence of Mbobomkulite

Type Locality:Mbobo Mkulu Cave, Nelspruit District, Mpumalanga Province, South Africa
Year of Discovery:1980

Crystallography of Mbobomkulite

Crystal System:Monoclinic
Cell Parameters:a = 10.17Å, b = 8.86Å, c = 17.14Å
β = 95.37°
Ratio:a:b:c = 1.148 : 1 : 1.935
Unit Cell Volume:V 1,537.64 ų (Calculated from Unit Cell)

Optical Data of Mbobomkulite

Type:Biaxial
RI values: nα = 1.515 nγ = 1.585
Maximum Birefringence:δ = 0.070

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively weak

Chemical Properties of Mbobomkulite

Formula:
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 3H
 
2
O
Essential elements:Al, H, N, Ni, O
All elements listed in formula:Al, Cu, H, N, Ni, O, S

Relationship of Mbobomkulite to other Species

Member of Group:
Chalcoalumite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
5.ND.05Likasite
Cu
 
3
[(OH)
 
5
|NO
 
3
] · 2H
 
2
O
5.ND.15Hydrombobomkulite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 13-14H
 
2
O
5.ND.20Sveite
KAl
 
7
[Cl|(OH)
 
8
|(NO
 
3
)
 
2
]
 
2
 · 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
13.1Nitratine
NaNO
 
3
13.2Niter
KNO
 
3
13.3Gerhardtite
Cu
 
2
[(OH)
 
3
|NO
 
3
]
13.4Nitromagnesite
Mg(NO
 
3
)
 
2
·6H
 
2
O
13.5Nitrocalcite
Ca(NO
 
3
)
 
2
·4H
 
2
O
13.6Nitrobarite
Ba(NO
 
3
)
 
2
13.7Buttgenbachite
Cu
 
19
[(OH)
 
32
|(NO
 
3
)
 
2
|Cl
 
4
] · 2H
 
2
O
13.8Sveite
KAl
 
7
[Cl|(OH)
 
8
|(NO
 
3
)
 
2
]
 
2
 · 8H
 
2
O
13.9Darapskite
Na
 
3
NO
 
3
SO
 
4
·H
 
2
O
13.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
·6H
 
2
O
13.12Hydrombobomkulite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 13-14H
 
2
O
13.13Nickelalumite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{SO
 
4
,(NO
 
3
)
 
2
}] · 3H
 
2
O
Related Minerals - Dana Grouping):

- +
19.2.4.2Hydrombobomkulite
(Ni,Cu)Al
 
4
[(OH)
 
12
|{(NO
 
3
)
 
2
,SO
 
4
}] · 13-14H
 
2
O

Other Names for Mbobomkulite

Synonyms:
IMA1979-078
Other Languages:
German:Mbobomkulit
Spanish:Mbobomkulita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mbobomkulite

Reference List:Martini, J.E.J. (1980) Mbobomkulite, hydrombobomkulite, and nickelalumite, new minerals from Mbobo Mkulu cave, eastern Transvaal. Annals of the Geological Survey of South Africa: 14(2): 1-110 (see: American Mineralogist (1982): 67: 415-416).

American Mineralogist (1982): 67: 415-416).

Internet Links for Mbobomkulite

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    Localities for Mbobomkulite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    South Africa
     
    • Mpumalanga Province
      • Nelspruit District
    		Ann.Geol.Surv.S.Africa,(1980) 14, n2, 1-110; Martini, J.E.J. et al (1997), "Mbobo Mkulu Cave, South Africa", in "Cave Minerals of the World" (1997)
    USA
     
    • Utah
      • San Juan Co.
        • White Canyon District
          • White Canyon
    		Can.Min.: (2001) 39( 6): 1685-1689.
    Mineral and/or Locality
    Google
     
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