Trigodomeykite

Cu3As
IMA status
  • Approved
IMA symbol
Do-β
Discovered
1949
Also known as
  • Domeykite-beta
  • Trigodomeykiet
  • β-Domeykite

Where it forms, where it's found

6recorded occurrences
Source · OpenStreetMap

Safety & handling

Physical

Transparency
Opaque
Fracture
Irregular/Uneven

Crystallography

Crystal system
Trigonal
Space group
P-3
Cell parameters
a = 7.1331(4) Å · c = 7.3042(5) Å
Unit cell volume
321.86 ų
Comment

Space group and cell params from Radosavljević-Mihajlović (2017).

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
29CuCopperCopper363.546190.638
71.79%
33AsArsenicArsenic174.92274.922
28.21%
Total265.560100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Domeykite-beta
  • Trigodomeykiet
  • β-Domeykite

In other languages

German
Domeykit-β · Trigodomeykit · β-Domeykit
Italian
domeykite-β

Classification

Strunz
10th ed.

2.AA

  • 2Sulfides and SulfosaltsClass
  • 2.AAlloysDivision
  • 2.AAAlloys of metalloids with Cu, Ag, AuGroup
  • 2.AATrigodomeykiteSpecies

Group, growth & confusion

Commonly confused with
1 mineral

Literature, links & citation

Citations
  1. 1938Steenberg, B. (1938) The crystal structure of Cu3As and Cu3P. Arkiv för Kemi, Mineralogi och Geologi, A 12(2), 1–15.
  2. 1949Michejev, V.I. (1949) On alpha-, beta- and gamma-domeykite. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 78: 3-7.
  3. 1960Heyding, R. D., Despault, G. J. G. (1960) The copper/arsenic system and the copper arsenide minerals. Canadian Journal of Chemistry, 38 (12). 2477-2481 doi:10.1139/v60-335 DOI: 10.1139/v60-335
  4. 1962Berry, L. G., Thompson, R. M. (1962) X-Ray Powder Data for Ore Minerals: the Peacock Atlas. GSA Memoir 85. Geological Society of America doi:10.1130/mem85DOI: 10.1130/mem85
  5. 1971Moore, Paul B. (1971) Copper-nickel arsenides of the Mohawk No. 2 Mine, Mohawk Keweenaw Co., Michigan. American Mineralogist, 56 (5-6) 1319-1331
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Trigodomeykite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/trigodomeykite-46462},
  note      = {Accessed 2026-05-11}
}