| Comancheite Mineral Data |
- 10.5.5.1 Comancheite Hg13(Cl,Br)8O9 Pnnm,Pnn2 Ortho
- III/D.06-10 Terlinguaite HgHgClO C 2/c 2/m
- III/D.06-11 Aurivilliusite! HgHgOI C 2/m 2/m
- III/D.06-12 Hanawaltite Hg6Hg[Cl,(OH)]2O3 Pbma 2/m 2/m 2/m
- III/D.06-13 Tedhadleyite! HgHg10O4I2(Cl1.16Br0.84)2 A1 1
- III/D.06-20 Poyarkovite Hg3ClO C 2/c 2/m
- III/D.06-30 Kadyrelite Hg4(Br,Cl)2O I a3d 4/m 3 2/m
- III/D.06-40 Eglestonite Hg6Cl3O(OH)(?) I a3d 4/m 3 2/m
- III/D.06-45 Vasilyevite! (Hg2)10O6I3Cl(CO3) P1 1
- III/D.06-50 Mosesite Hg2N(Cl,SO4,MoO4,CO3)·(H2O) F43m 4 3m
- III/D.06-60 Gianellaite Hg4(SO4)N2 F43m 4 3m
- III/D.06-70 Kleinite Hg2N(Cl,SO4)·n(H2O) C63/mmc 6/m 2/m 2/m
- III/D.06-80 Pinchite Hg5O4Cl2 I bam 2/m 2/m 2/m
- III/D.06-90 Comancheite Hg13(Cl,Br)8O9 Pnnm,Pnn2 Ortho
General Comancheite Information |
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 Chemical Formula: |
Hg13(Cl,Br)8O9 | ||
| Composition: |
Molecular Weight = 3,079.74 gm | ||
| Mercury 84.67 % Hg 91.43 % HgO | |||
| Bromine 2.59 % Br 2.59 % Br | |||
| - % Br -0.26 % -O=Br2 | |||
| Chlorine 8.06 % Cl 8.06 % Cl | |||
| - % Cl -1.82 % -O=Cl2 | |||
| Oxygen 4.68 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Hg13Cl7BrO9 | ||
| Environment: |
Encrusting calcite. | ||
| IMA Status: |
Approved IMA 1981 | ||
| Locality: |
Mariposa mine, Terlingua district, Brewster County, Texas, USA. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the Comanche Indians, who were the first miners in the Terligua district, using cinnabar for war paint. | ||
Comancheite Image | |||
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Images:
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Comancheite Crystallography |
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| Axial Ratios: |
a:b:c =0.8507:1:0.3085 | ||
| Cell Dimensions: |
a = 18.41, b = 21.64, c = 6.677, Z = 4; V = 2,660.07 Den(Calc)= 7.69 | ||
| Crystal System: |
OrthorhombicSpace Group: Pnnm,Pnn2 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.669(1), 2.878(0.8), 5.68(0.7), | ||
Physical Properties of Comancheite |
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| Cleavage: |
[001] Distinct, [110] Distinct | ||
| Color: |
Yellow, Orange red, Red. | ||
| Density: |
7.7 | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Acicular - Occurs as needle-like crystals. | ||
| Habit: |
Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point. | ||
| Hardness: |
2 - Gypsum | ||
| Luster: |
Vitreous - Resinous | ||
| Streak: |
orange | ||
Optical Properties of Comancheite |
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| Gladstone-Dale: |
CI meas= 0.29 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.289 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1021,KPDmeas= 0.1019,KC= 0.1435 |
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| Optical Data: |
Biaxial (?), a=1.78, g=1.79, bire=0.0100 | ||
Calculated Properties of Comancheite |
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| Electron Density: |
relectron=6.32 gm/cc |
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| Fermion Index |
Fermion Index = 0.25573 Boson Index = 0.74427 |
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| Photoelectric: |
PEComancheite =1,460.84 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Comancheite is Not Radioactive |
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Comancheite Classification |
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| Dana Class: |
10.5.5.1 (10)Oxyhalides and Hydroxyhalides | ||
| (10.5)where Am (O,OH)p Xq | |||
| (10.5.5)Dana Group | |||
| Strunz Class: |
III/D.06-90 III - Halogenides | ||
| III/D - Oxi-halogenides with mercury | |||
| III/D.06 - Terlinguaite - Comancheite | |||
Other Comancheite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Comancheite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Comancheite using: Visit our Advertisers for Comancheite : Translate Comancheite Mineral Data : Ask about Comancheite here : Print or Cut-and-Paste your Comancheite Specimen Label here :
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