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Comancheite

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Formula:
Hg2+55N3–24(NH2,OH)4(Cl,Br)34
Originally assumed to be Hg2+13(Cl,Br)8O9.
Formula revised (IMA 13-B).
Hardness:
2
Crystal System:
Orthorhombic
Name:
Named in honor of the Comanche, a Native American nation and "the first miners in the Terlingua district...who used cinnabar for warpaint."
This page provides mineralogical data about Comancheite.


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Classification of ComancheiteHide

Approved
Notes:
Renamed by the IMA
Approval History:
Renamed by IMA: 2013
3.DD.65

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
10.5.5.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
8.5.8

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
5 : Halides of Zn and Hg

Physical Properties of ComancheiteHide

Hardness:

Optical Data of ComancheiteHide

Type:
Biaxial
RI values:
nα = 1.780 nγ = 1.790
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v distinct

Chemical Properties of ComancheiteHide

Formula:
Hg2+55N3–24(NH2,OH)4(Cl,Br)34

Originally assumed to be Hg2+13(Cl,Br)8O9.
Formula revised (IMA 13-B).
IMA Formula:
Hg2+55N3-24(NH2,OH)4(Cl,Br)34

Crystallography of ComancheiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 18.41 Å, b = 21.64 Å, c = 6.67 Å
Ratio:
a:b:c = 0.851 : 1 : 0.308
Unit Cell V:
2,657.28 ų (Calculated from Unit Cell)

Type Occurrence of ComancheiteHide

Synonyms of ComancheiteHide

Other Language Names for ComancheiteHide

German:Comancheit
Spanish:Comancheita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite5 photos of Comancheite associated with Calcite on mindat.org.
Goethite1 photo of Comancheite associated with Goethite on mindat.org.
Cinnabar1 photo of Comancheite associated with Cinnabar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DD.05Eglestonite(Hg2+2)3OCl3(OH)Iso. m3m (4/m 3 2/m) : Ia3d
3.DD.05Kadyrelite(Hg2+2)3OBr3(OH)Iso.
3.DD.10Poyarkovite(Hg2+2)3Cl2O2Mon. 2/m : B2/b
3.DD.15Hanawaltite(Hg2+2)3Hg2+(Cl,OH)2O3Orth. mmm (2/m 2/m 2/m)
3.DD.20Terlinguaite(Hg2+2)Hg2+2Cl2O2Mon. 2/m : B2/m
3.DD.25PinchiteHg2+5Cl2O4Orth.
3.DD.30Gianellaite[(NHg2)2](SO4)(H2O)xIso. 4 3m : F4 3m
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2OIso.
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DD.40Tedhadleyite(Hg+2)5Hg2+I2(Cl,Br)2O4Tric.
3.DD.45Vasilyevite(Hg+2)10I3Br2Cl(CO3)O6Tric. 1 : P1
3.DD.50Aurivilliusite(Hg+2)0.5Hg2+(I,Br,Cl)OMon. 2/m : B2/b
3.DD.55TerlinguacreekiteHg2+3Cl2O2Orth.
3.DD.60Kelyanite(Hg+2)6Sb3+BrCl2O6Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.5.1SimonkolleiteZn5Cl2(OH)8 · H2OTrig. 3m (3 2/m) : P3m1
8.5.2Calomel(Hg2)2+Cl2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.5.3Terlinguaite(Hg2+2)Hg2+2Cl2O2Mon. 2/m : B2/m
8.5.4Poyarkovite(Hg2+2)3Cl2O2Mon. 2/m : B2/b
8.5.5PinchiteHg2+5Cl2O4Orth.
8.5.6Eglestonite(Hg2+2)3OCl3(OH)Iso. m3m (4/m 3 2/m) : Ia3d
8.5.7Kadyrelite(Hg2+2)3OBr3(OH)Iso.
8.5.9Kuzminite(Hg2+2)(Br,Cl)2Tet.
8.5.10Moschelite(Hg2+2)I2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.5.11Tocornalite(Ag,Hg)I

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ComancheiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Ansell, H.G., Dunn, P.J. (1981) Comancheite, a new mercury oxychloride-bromide from Terlingua, Texas. Canadian Mineralogist: 19: 393-396.
Cooper, M.A., Abdu, Y.A., Hawthorne, F.C., Kampf, A.R. (2013) The crystal structure of comancheite, Hg2+55N3-24(OH,NH2)4(Cl,Br)34, and crystal-chemical and spectroscopic discrimination of N3- and O2- anions in Hg2+ compounds. Mineralogical Magazine: 77: 3217-3237.

Internet Links for ComancheiteHide

Localities for ComancheiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Rhineland-Palatinate
    • Palatinate
      • Kirchheimbolanden
        • Mörsfeld
Wittern: "Mineralfundorte in Deutschland", 2001
USA
 
  • Texas
    • Brewster Co.
[MinRec 21:233]
Charles Creekmur collection
Canadian Mineralogist (1981): 19: 393-396.
Mineral and/or Locality  
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