Arsenic-bearing Pyrite

Fe(S,As)2
Also known as
  • Arsenian Pyrite
Variety of
Pyrite
PyriteFeS2

Where it forms, where it's found

135recorded occurrences
Source · OpenStreetMap

Safety & handling

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
33AsArsenicArsenic274.922149.844
55.54%
16SSulfurSulfur232.06064.120
23.76%
26FeIronIron155.84555.845
20.70%
Total269.809100.00%

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

From Mindat formula

Synonyms

  • Arsenian Pyrite

Literature, links & citation

Citations
  1. 1971Burkart-Baumann, I., Ottemann, J. (1971) Arsenführende Pyrite mit Bravoit-ähnlichen Strukturen. Mineralium Deposita, 6 (2). 148-152 doi:10.1007/bf00206626DOI: 10.1007/bf00206626
  2. 1988Fleet, M.E., MacLean, P.J., and Barbier, J. (1988): Oscillatory-zoned As-bearing pyrite from strata-bound and stratiform gold deposits: an indicator of ore-fluid evolution. Economic Geology, Monograph 6: 356-362.
  3. 1993Fleet, M.E., Chryssoulis, S.L., MacLean, P.J., Davidson, R., and Weisener, C.G. (1993) Arsenian pyrite from gold deposits: Au and As distribution investigated by SIMS and EMP and color staining and surface oxidation by XPS and LIMS. Canadian Mineralogist: 31: 1-17.
  4. 1993Arehart, Greg B., Chryssoulis, Stephen L., Kesler, Stephen E. (1993) Gold and arsenic in iron sulfides from sediment-hosted disseminated gold deposits; implications for depositional processes. Economic Geology, 88 (1) 171-185 doi:10.2113/gsecongeo.88.1.171DOI: 10.2113/gsecongeo.88.1.171
  5. 1997Fleet, Michael E., Mumin, A. Hamid (1997) Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin Trend gold deposits and laboratory synthesis. American Mineralogist, 82 (1) 182-193 doi:10.2138/am-1997-1-220 DOI: 10.2138/am-1997-1-220
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Arsenic-bearing Pyrite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/arsenic-bearing-pyrite-29212},
  note      = {Accessed 2026-05-11}
}