General Zincohogbomite-2N2S Information
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Chemical Formula: |
(Zn,Fe++)(2-2x)(Ti)xAl4O8 |
Composition: |
Molecular Weight = 335.37 gm |
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Titanium 3.43 % Ti 5.72 % TiO2 |
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Aluminum 32.18 % Al 60.81 % Al2O3 |
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Zinc 15.40 % Zn 19.17 % ZnO |
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Iron 10.82 % Fe 13.92 % FeO |
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Oxygen 38.17 % O |
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______ ______ |
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100.00 % 99.62 % = TOTAL OXIDE |
Empirical Formula: |
Zn0.79Fe2+0.65Ti0.24Al4O8 |
Environment: |
Formed by breakdown of gahnite in diasporites (diaspore-bearing metabauxites) and emeries (corundum-bearing metabauxites). |
IMA Status: |
Approved IMA 1994 (Dana # Added) |
Locality: |
Emory deposit at Kerketefs Mountain, Samos Island, Greece. Link to MinDat.org Location Data. |
Name Origin: |
Named as the Zn dominant analogue of högbomite, found as the 8H and 16H polytypes. (S=Spinel, N=Nolanite Layers). |
Synonym: |
IMA1994-016 |
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IMA2001-A |
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Zincohogbomite-8H |
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Zincohogbomite-2N2S Image |
Images:
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Zincohogbomite-2N2S Corundum
Comments: Thin-Section (Plane Polarized Light) of a brown, twinned zincoh?gbomite-2N2S crystal with blue corundum.
Location: Mikro-Lakka Emery deposit, Kerketeas Mt, S?mos Island, Aegean Islands Department, Greece.
Scale: Picture size 1.1 mm.
© Thomas Witzke / Abraxas-Verlag |
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Zincohogbomite-2N2S Crystallography
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Axial Ratios: |
a:c = 1:3.20777 |
Cell Dimensions: |
a = 5.708, c = 18.31, Z = 4; V = 516.64 Den(Calc)= 4.31 |
Crystal System: |
Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 63mc |
X Ray Diffraction: |
By Intensity(I/Io): 2.42(1), 1.425(0.8), 2.6(0.8), |
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Physical Properties of Zincohogbomite-2N2S
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Cleavage: |
None |
Color: |
Deep brown, Black. |
Density: |
4.36 |
Diaphaniety: |
Transparent to Opaque |
Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
Habit: |
Pseudo Tetragonal - Crystals show a tetragonal shape. |
Hardness: |
7 - Quartz |
Luster: |
Adamantine |
Streak: |
brownish |
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Optical Properties of Zincohogbomite-2N2S
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Gladstone-Dale: |
CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1984,KPDmeas= 0.1961,KC= 0.2048 |
Optical Data: |
Uniaxial (-), e=1.832, w=1.878, bire=0.0460. |
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Calculated Properties of Zincohogbomite-2N2S
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Electron Density: |
relectron=4.16 gm/cc note: rZincohogbomite-2N2S =4.31 gm/cc. |
Fermion Index |
Fermion Index = 0.01322 Boson Index = 0.98678 |
Photoelectric: |
PEZincohogbomite-2N2S = 12.40 barns/electron U=PEZincohogbomite-2N2S x relectron= 51.59 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Zincohogbomite-2N2S is Not Radioactive |
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Zincohogbomite-2N2S Classification
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Dana Class: |
7.11.7.4 (7)Multiple Oxides |
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(7.11)as titano-oxides with [4] and [6] substitutions |
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(7.11.7)Hogbomite Group (Ti>Sn) |
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7.11.7.1 Magnesiohogbomite-2N3S (Mg,Fe)1.4Ti0.3Al4O8 P 63mc 6mm |
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7.11.7.2 Magnesiohogbomite-2N2S (Al,Fe,Fe,Mg,Ti,Zn)11O15(OH) P 63mc 6mm |
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7.11.7.3 Magnesiohogbomite-6N6S (Mg,Fe)1.4Ti0.3Al4O8 R 3m 3 2/m |
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7.11.7.4 Zincohogbomite-2N2S ! (Zn,Fe)(2-2x)(Ti)xAl4O8 P 63mc 6mm |
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7.11.7.5 Ferrohogbomite-2N2S! (Fe,Zn,Mg,Al)6Al14(Ti,Fe)2O30(OH)2 P 63mc 6mm |
Strunz Class: |
IV/C.07-15 IV - Oxides |
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IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds) |
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IV/C.07 - Högbomite - Mengxianminite series |
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IV/C.07-10* Magnesiohogbomite-2N2S (Al,Fe,Fe,Mg,Ti,Zn)11O15(OH) P 63mc 6mm |
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IV/C.07-10** Magnesiohogbomite-2N3S (Mg,Fe)1.4Ti0.3Al4O8 P 63mc 6mm |
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IV/C.07-10 Magnesiohogbomite-6N6S (Mg,Fe)1.4Ti0.3Al4O8 R 3m 3 2/m |
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IV/C.07-15 Zincohogbomite-2N2S (Zn,Fe)(2-2x)(Ti)xAl4O8 P 63mc 6mm |
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IV/C.07-17 Ferrohogbomite-2N2S! (Fe,Zn,Mg,Al)6Al14(Ti,Fe)2O30(OH)2 P 63mc 6mm |
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IV/C.07-20 Freudenbergite Na2Fe2Ti6O16 C 2/m 2/m |
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IV/C.07-30 Kamiokite Fe2Mo3O8 P 63mc 6mm |
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IV/C.07-40 Nolanite (V,Fe,Fe,Ti)10O14(OH)2 P 63mc 6mm |
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IV/C.07-42 Rinmanite! (Zn,Mn)2Sb2Mg2Fe4O14(OH)2 P 63mc 6mm |
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IV/C.07-45 Magnesionigerite-2N1S (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 P 3m 3 2/m |
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IV/C.07-45* Magnesionigerite-6N6S (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 Unk Trig |
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IV/C.07-50 Ferronigerite-2N1S (Zn,Mg,Fe)(Sn,Zn)2(Al,Fe)12O22(OH)2 P 3m or P 3m1 3 2/m
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IV/C.07-50* Ferronigerite-6N6S (Fe,Zn)4Sn2(Al,Fe)15O30(OH)2 R 3m 3 2/m |
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IV/C.07-60 Mengxianminite* (Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29 Unk Ortho |
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Other Zincohogbomite-2N2S Information
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References: |
NAME( AmMin, Vol. 84, No. 7-8) PHYS. PROP.(AmMin, Vol. 78, No. 7-8) OPTIC PROP.(AmMin, Vol. 84, No. 7-8) |
See Also: |
Links to other databases for Zincohogbomite-2N2S :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
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Zincohogbomite-2N2S
(Zn,Fe++)(2-2x)(Ti)xAl4O8
Dana No: 7.11.7.4 Strunz No: IV/C.07-15
Locality:
Notes:
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