UM1995-20-OH:AlMgMnNi
Valid as an unnamed mineral
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Formula:
Mn4+(O,OH)2(Mg,Ni,Al,OH)2 · nH2O
Crystal System:
Hexagonal
Reported as Mg-dominant analogue of asbolane. Chemically similar to jianshuiite.
Found in manganese-rich crusts in a drilling core recovered by JOIDES Resolution vessel from a guyot.
Electron microprobe analysis results (EDS mode, mean of 12 analyses, normalized to 100%, OH by analogy to asbolane, wt%): MgO 9.96, Al2O3 4.12, K2O 0.69, CaO 2.06, MnO 76.83, NiO 6.34. Corresponds to [Mn4+O1.6(OH)0.4]0.4+[(Mg0.28Al0.09Ni0.l)Ca0.04K0.02(OH)1.53]0.4-•nH2O.
In the structure there are ordered (ABAB) layers. There are two sublattices. In one of them the a parameter corresponds to Mn4+-bearing octahedra layers; the other layer has Mg, Ni, and presumably Al. Total thickness of first and second layers is equal to c. "Uninterrupted gradiation from asbolane to buserite" also reported.
Found in manganese-rich crusts in a drilling core recovered by JOIDES Resolution vessel from a guyot.
Electron microprobe analysis results (EDS mode, mean of 12 analyses, normalized to 100%, OH by analogy to asbolane, wt%): MgO 9.96, Al2O3 4.12, K2O 0.69, CaO 2.06, MnO 76.83, NiO 6.34. Corresponds to [Mn4+O1.6(OH)0.4]0.4+[(Mg0.28Al0.09Ni0.l)Ca0.04K0.02(OH)1.53]0.4-•nH2O.
In the structure there are ordered (ABAB) layers. There are two sublattices. In one of them the a parameter corresponds to Mn4+-bearing octahedra layers; the other layer has Mg, Ni, and presumably Al. Total thickness of first and second layers is equal to c. "Uninterrupted gradiation from asbolane to buserite" also reported.
Unique Identifiers
Mindat ID:
53614
Long-form identifier:
mindat:1:1:53614:9
IMA Classification of UM1995-20-OH:AlMgMnNi
IMA status notes:
Unnamed (probably valid)
Chemistry of UM1995-20-OH:AlMgMnNi
Mindat Formula:
Mn4+(O,OH)2(Mg,Ni,Al,OH)2 · nH2O
Element Weights:
Crystallography of UM1995-20-OH:AlMgMnNi
Crystal System:
Hexagonal
Cell Parameters:
a = 2.83 or 3.03 Å, c = 9.30 Å
Ratio:
a:c = 1 : 3.286
Unit Cell V:
64.50 ų (Calculated from Unit Cell)
Comment:
"hexagonal" concerns two sublattices (hence two a parameters)
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for UM1995-20-OH:AlMgMnNi
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https://www.mindat.org/min-53614.html
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References for UM1995-20-OH:AlMgMnNi
Reference List:
Gorshkov, A.I., Bogdanov, Yu.A., Sivtsov, A.V., Mokhov, S.V. (1995): A new Mg-Al-Ni asbolane. Doklady Akad. Nauk: 342(6): 781-784 (in Russian).(Abs. in: Jambor, J.L., Pertsev, N.N., Roberts, A.C. (1996): New mineral names. American Mineralogist: 81: 766)
Localities for UM1995-20-OH:AlMgMnNi
Showing 1 localities.
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The Locality List
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All localities listed without proper references should be considered as questionable.
Marshall Islands | |
| Gorshkov et al. (1995) +1 other reference |
