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 % Al₂O₃

Zinc 4.07 % Zn 5.07 % ZnO

Iron 5.79 % Fe 1.49 % FeO / 6.63 % Fe₂O₃

Silicon 0.58 % Si 1.25 % SiO₂

Tin 14.78 % Sn 18.76 % SnO₂

Hydrogen 0.21 % H 1.87 % H₂O

Oxygen 39.83 % O

______ ______

100.00 % 99.59 % = TOTAL OXIDE

Empirical Formula:

Mg_1.9Zn_0.6AlSi_0.2Fe²⁺_0.2Sn_1.2Fe³⁺_0.8Al_9.7O₂₂(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

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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:

TrigonalSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Magnesionigerite-6N6S}= 47.21 barns/electron
U=PE_{Magnesionigerite-6N6S} x rElectron 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 3m 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 3m 3 2/m

04.FC.20 Ferronigerite-2N1S (Zn,Mg,Fe)(Sn,Zn)2(Al,Fe)12O22(OH)2 P 3m or P 3m1 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 3m 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:

Notes: