https://www.edelsteine-neuburg.de
https://www.mineralbox.biz
https://www.mineral-bosse.de
http://www.spessartit.de/walldorf.html
https://www.mineraliengrosshandel.com
'._('einklappen').'
 

Comancheite (Comancheit)

Pictures (1 Images total)

Comancheit
Views (File:
1549119202
): 434
Comancheit
Terlingua District, Texas, USA. BB 1,9mm; Ex. R. Feigl Sammlung
Copyright: Mabu; Contribution: Mabu
Location: USA/Texas/Brewster Co./Terlingua District
Mineral: Comancheite
Image: 1549119202
License: Usage for Mineralienatlas project only
Comancheit

Terlingua District, Texas, USA. BB 1,9mm; Ex. R. Feigl Sammlung
Copyright: Mabu
Contribution: Mabu 2019-02-02
Locality: Terlingua District / Brewster Co. / Texas / USA

Collectors Summary

Color orangerot, gelb
Streak color orangegelb
Hardness (Mohs) 2
Solubility ++ KOH, - Säuren
Crystal System orthorhombisch, Pnn2, Pnnm

Chemism

Chemical formula

Hg13(Cl,Br)8O9

Additional chem. information

Laut CNMNC Antrag: IMA 13-B kein Bromit sondern ein Nitrit: Hg2+55Nx(NH2,OH)4(Cl,Br)34 {x = 3-24}

Chemical composition

Brom, Chlor, Quecksilber, Sauerstoff

Unit weight: 3124.21827 u; Number of atoms in the formula: 30

Info

Empirical formula:

Hg13(Cl0.75Br0.25)8O9

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

4.61

9

30.00

15.9994300

143.9948700
Chlorine

Cl

6.81

6

20.00

35.4532000

212.7192000
Bromine

Br

5.12

2

6.67

79.9041000

159.8082000
Mercury

Hg

83.47

13

43.33

200.5920000

2,607.6960000

Analysis wt%

HgO : 89.70, Cl : 5.10, Br : 8.90 (Ref: Canadian Mineralogist 81)

Strunz 9th edition incl. updates

3.DD.65

3: Halide (Fluoride, Chloride, Bromide, Iodide)
D: Oxihalide, Hydroxyhalide und verwandte Doppel-Halide
D: mit [Hg]
65:Comancheit-Gruppe

Lapis Classification

III/D.06-090

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
D: Oxihalogenide
6: Oxihalogenide mit Quecksilber

Classification by Hölzel

3.FB.170

3: HALIDES
F: With Mercury
B: Terlinguaite-Kelyanite-Group

Dana 8th edition

10.05.05.01

10: Oxyhalides and Hydroxyhalides
05: Oxyhalides and Hydroxyhalides where Am (O,OH)p Xq

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

orangerot, gelb

Streak color

orangegelb

max. Birefringence

0.01!

RI value α / ω / n

1.78!!

RI value γ / ε

1.79!!

2V angle

Biaxial

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2, mmm

Space Group number

34, 58

Space Group

Pnn2, Pnnm

Cell parameters a (Å)

18.41

Cell parameters b (Å)

21.64

Cell parameters c (Å)

6.677

Cell parameters a/b or c/a

0.851

Cell parameters c/b

0.309

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

2660.066

X-Ray Powder Diffraction

5.68(70),
5.42(60),
4.42(40),
2.878(80),
2.710(50),
2.669(100),
2.457(50),
1.415(50)
XRD chart Comancheite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

VHN (Hardness Vickers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

7.7 (gemessen)

7.801 ( ρ calc. Mineralienatlas )

Instability

++ KOH, - Säuren

(Co-)Type locality

(Co-)Type locality

USA/Texas/Brewster Co./Terlingua District/Mariposa Mine (California Mountain Mine)

Preface

Author (Name, Year)

Roberts & Ansell & Dunn, 1981

References

Canadian Mineralogist 19 (1981), 393

NOMENCLATURE PROPOSAL APPROVED IN MAY 2013, IMA 13-B, Revision of the chemical formula of comancheite On the basis of a single crystal X-ray diffraction study, it has been shown that the accepted chemical formula of the mineral comancheite is incorrect. Comancheite was described in 1981 as a mercury oxychloride-bromide with formula Hg13(Cl,Br)8O9. It is in fact a mercury nitride with formula Hg2+55N3–24(NH2,OH)4(Cl,Br)34. - CNMNC Newsletter No. 16, August 2013, page 2708; Mineralogical Magazine, 77, 2695-2709.

Other languages

German

Comancheit

English

Comancheite

French

Comancheite

Spanish

Comancheíta

Russian

Команчеит

Alternative Name

German

Komantscheit

CNMNC (IMA)-Number

IMA 1980-077

CNMNC symbol

Symbol

Cmc

Locations with GPS information