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Comancheite

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Formula:
Hg
2+
55
N
3–
24
(NH
 
2
,OH)
 
4
(Cl,Br)
 
34
Originally assumed to be Hg2+13(Cl,Br)8O9.
Formula revised (IMA 13-B).
System:OrthorhombicHardness:2
This page provides mineralogical data about Comancheite.

Classification of Comancheite

IMA status:Redefined Approved 2013
Strunz 8th edition ID:3/D.06-90
Nickel-Strunz 10th (pending) edition ID:3.DD.65

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
Dana 8th edition ID:10.5.5.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
Hey's CIM Ref.: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

Type Locality:Mariposa Mine (California Mountain Mine), Terlingua District, Brewster Co., Texas, USA
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
Maximum Birefringence:δ = 0.010

Chart 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:
Hg
2+
55
N
3–
24
(NH
 
2
,OH)
 
4
(Cl,Br)
 
34


Originally assumed to be Hg2+13(Cl,Br)8O9.
Formula revised (IMA 13-B).
Simplified for copy/paste:Hg2+55N3–24(NH2,OH)4(Cl,Br)34
Essential elements:Cl, H, Hg, N
All elements listed in formula:Br, Cl, H, Hg, N, O

Relationship of Comancheite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DD.05Eglestonite
(Hg
2+
2
)
 
3
OCl
 
3
(OH)
3.DD.05Kadyrelite
(Hg
2+
2
)
 
3
OBr
 
3
(OH)
3.DD.10Poyarkovite
(Hg
+
2
)
 
1.5
ClO
3.DD.15Hanawaltite
(Hg
+
2
)
 
3
Hg
2+
 
(Cl,OH)
 
2
O
 
3
3.DD.20Terlinguaite
(Hg
+
2
)
 
0.5
Hg
2+
 
ClO
3.DD.25Pinchite
Hg
2+
5
Cl
 
2
O
 
4
3.DD.30Gianellaite
(Hg
 
2
N)
 
2
SO
 
4
3.DD.30Mosesite
(Hg
 
2
N)(Cl,SO
 
4
,MoO
 
4
) · H
 
2
O
3.DD.35Kleinite
(Hg
 
2
N)(Cl,SO
 
4
) · nH
 
2
O
3.DD.40Tedhadleyite
(Hg
+
2
)
 
5
Hg
2+
 
I
 
2
(Cl,Br)
 
2
O
 
4
3.DD.45Vasilyevite
(Hg
+
2
)
 
10
I
 
3
Br
 
2
Cl(CO
 
3
)O
 
6
3.DD.50Aurivilliusite
(Hg
+
2
)
 
0.5
Hg
2+
 
(I,Br,Cl)O
3.DD.55Terlinguacreekite
Hg
2+
3
Cl
 
2
O
 
2
3.DD.60Kelyanite
(Hg
+
2
)
 
6
Sb
3+
 
BrCl
 
2
O
 
6
Related Minerals - Hey's Index Grouping:

- +
8.5.1Simonkolleite
Zn
 
5
Cl
 
2
(OH)
 
8
· H
 
2
O
8.5.2Calomel
(Hg
+
2
)Cl
 
2
8.5.3Terlinguaite
(Hg
+
2
)
 
0.5
Hg
2+
 
ClO
8.5.4Poyarkovite
(Hg
+
2
)
 
1.5
ClO
8.5.5Pinchite
Hg
2+
5
Cl
 
2
O
 
4
8.5.6Eglestonite
(Hg
2+
2
)
 
3
OCl
 
3
(OH)
8.5.7Kadyrelite
(Hg
2+
2
)
 
3
OBr
 
3
(OH)
8.5.9Kuzminite
(Hg
+
2
)(Br,Cl)
 
2
8.5.10Moschelite
(Hg
+
2
)I
 
2
8.5.11Tocornalite
(Ag,Hg)I

Other Names for Comancheite

Synonyms:
IMA1980-077
Other Languages:
German:Comancheit
Spanish:Comancheita

Other Information

Health Warning: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:

- +
American Mineralogist: 67: 622.

Internet Links for Comancheite

Search Engines:
  • Look for Comancheite on Google
  • Look for Comancheite images on Google
  • External Links:
  • Comancheite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Comancheite specimens for sale - minfind.com
  • Buy from McDougall Minerals
  • Buy from David K Joyce minerals
  • Buy fine minerals and gemstones from Pala International
  • The Arkenstone - Fine Minerals
  • Buy minerals from YourMineralCollection
  • Wilensky Fine Minerals
  • Rare and Unusual minerals at Mineralogical Research Company
  • High-end worldwide specimens & outstanding customer service
  • Search for Comancheite on Well-Arranged Molecules
  • Fine Minerals from Weinrich Minerals, Inc.
  • Localities for Comancheite

    The 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. ? 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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