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Comancheite

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Formula:
Hg552+N243–(NH2,OH)4(Cl,Br)34
Originally assumed to be Hg2+13(Cl,Br)8O9.
Formula revised (IMA 13-B).
System:
Orthorhombic
Hardness:
2
This page provides mineralogical data about Comancheite.

Classification of Comancheite

Redefined Approved 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
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Type Occurrence of Comancheite

Year of Discovery:
1981

Physical Properties of Comancheite

Hardness (Mohs):
2

Crystallography of Comancheite

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

Optical Data of Comancheite

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 Comancheite

Formula:
Hg552+N243–(NH2,OH)4(Cl,Br)34

Originally assumed to be Hg2+13(Cl,Br)8O9.
Formula revised (IMA 13-B).
Essential elements:
All elements listed in formula:

Relationship of Comancheite to other Species

3.DD.05Eglestonite(Hg22+)3OCl3(OH)
3.DD.05Kadyrelite(Hg22+)3OBr3(OH)
3.DD.10Poyarkovite(Hg22+)3Cl2O2
3.DD.15Hanawaltite(Hg22+)3Hg2+(Cl,OH)2O3
3.DD.20Terlinguaite(Hg22+)Hg22+Cl2O2
3.DD.25PinchiteHg52+Cl2O4
3.DD.30Gianellaite(Hg2N)2SO4
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2O
3.DD.40Tedhadleyite(Hg2+)5Hg2+I2(Cl,Br)2O4
3.DD.45Vasilyevite(Hg2+)10I3Br2Cl(CO3)O6
3.DD.50Aurivilliusite(Hg2+)0.5Hg2+(I,Br,Cl)O
3.DD.55TerlinguacreekiteHg32+Cl2O2
3.DD.60Kelyanite(Hg2+)6Sb3+BrCl2O6
8.5.1SimonkolleiteZn5Cl2(OH)8 · H2O
8.5.2Calomel(Hg22+)Cl2
8.5.3Terlinguaite(Hg22+)Hg22+Cl2O2
8.5.4Poyarkovite(Hg22+)3Cl2O2
8.5.5PinchiteHg52+Cl2O4
8.5.6Eglestonite(Hg22+)3OCl3(OH)
8.5.7Kadyrelite(Hg22+)3OBr3(OH)
8.5.9Kuzminite(Hg22+)(Br,Cl)2
8.5.10Moschelite(Hg22+)I2
8.5.11Tocornalite(Ag,Hg)I

Other Names for Comancheite

Name in Other Languages:
German:Comancheit
Spanish:Comancheita

Other Information

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 Comancheite

Reference List:
Roberts, A.C., Ansell, H.G. and 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. and 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 Comancheite

Localities for Comancheite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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