Magnesionigerite-6N6S Mineral Data
General Magnesionigerite-6N6S Information
Chemical Formula:
(Mg,Zn,Fe+++,Al)4(Sn,Fe+++)2Al10O22(OH)2
Composition:
Molecular Weight = 964.03 gm
Magnesium 4.79 % Mg 7.94 % MgO
Aluminum 29.95 % Al 56.58 % Al2 O3
Zinc 4.07 % Zn 5.07 % ZnO
Iron 5.79 % Fe 1.49 % FeO / 6.63 % Fe2 O3
Silicon 0.58 % Si 1.25 % SiO2
Tin 14.78 % Sn 18.76 % SnO2
Hydrogen 0.21 % H 1.87 % H2 O
Oxygen 39.83 % O
______ ______
100.00 % 99.59 % = TOTAL OXIDE
Empirical Formula:
Mg1.9 Zn0.6 AlSi0.2 Fe2+ 0.2 Sn1.2 Fe3+ 0.8 Al9.7 O22 (OH)2
Environment:
The Mg-analog of nigerite. High temperature metasomatic tungsten ore. Fomerly named Pengzhizhongite-24R for Peng Zhizhong, late Chinese mineralogist.
IMA Status:
Approved IMA 2002 (Dana # Added)
Locality:
Anhua area, Hunan, China. Link to MinDat.org Location Data.
Name Origin:
Named as the MAGNESIum analog of Ferronigerite. (S=Spinel, N=Nolanite Layers).
Synonym:
IMA2001-A
Pengzhizhongite-24R
Magnesionigerite-6N6S Crystallography
Axial Ratios:
a:c = 1:2.42094
Cell Dimensions:
a = 5.692, c = 13.78, Z = 1; V = 386.64 Den(Calc)= 4.14
Crystal System:
Trigonal Space Group: Unk
X Ray Diffraction:
By Intensity(I/Io ): 2.423(1), 2.846(0.9), 1.414(0.5),
Physical Properties of Magnesionigerite-6N6S
Color:
Brown, Light yellow, Colorless.
Density:
4.22
Diaphaneity:
Transparent
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
8-8.5 - Between Topaz and Chrysoberyl
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Magnesionigerite-6N6S
Gladstone-Dale:
CI meas = 0.045 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = 0.026 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1952,KPDmeas = 0.1915,KC = 0.2005 Ncalc = 1.83 - 1.85
Optical Data:
Uniaxial (+), w=1.802, e=1.814, bire=0.0120.
Calculated Properties of Magnesionigerite-6N6S
Electron Density:
Bulk Density (Electron Density)=3.97 gm/cc note: Specific Gravity of Magnesionigerite-6N6S =4.14 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEMagnesionigerite-6N6S = 47.21 barns/electronU=PEMagnesionigerite-6N6S x r Electron Density= 187.60 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Magnesionigerite-6N6S is Not Radioactive
Magnesionigerite-6N6S Classification
Dana Class:
07.11.09.02 (07) Multiple Oxides
(07.11) as titano-oxides with [4] and [6] substitutions
(07.11.09) Nigerite Group (Sn>Ti)
07.11.09.02 Magnesionigerite-6N6S ! (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 Unk Trig
07.11.09.10 Magnesionigerite-2N1S (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 P 3 m 3 2/m
Strunz Class:
04.FC.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
04.F - Hydroxides (without V or U)
04.FC -Hydroxides with OH, without H2O; corner-sharing octahedra
04.FC.20 Ferronigerite-6N6S ! (Fe,Zn)4Sn2(Al,Fe)15O30(OH)2 R 3 m 3 2/m
04.FC.20 Ferronigerite-2N1S (Zn,Mg,Fe)(Sn,Zn)2(Al,Fe)12O22(OH)2 P 3 m or P 3 m1 3 2/m
04.FC.20 Magnesionigerite-6N6S ! (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 Unk Trig
04.FC.20 Magnesionigerite-2N1S (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 P 3 m 3 2/m
Other Magnesionigerite-6N6S Information
References:
NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.76,p1728,1991) OPTIC PROP.(Am.Min.,Vol.76,p1728,1991)
See Also:
Links to other databases for Magnesionigerite-6N6S :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Magnesionigerite-6N6S
(Mg,Zn,Fe+++,Al)4(Sn,Fe+++)2Al10O22(OH)2
Dana No: 07.11.09.02 Strunz No: 04.FC.20
Locality:
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