Where it forms, where it's found
- Geological setting
Oxidation product of tetradymite and pyrite.
- Type locality
- San Martín de Porres Mine
- Yécora
- Yécora Municipality
- Sonora
- Mexico
6recorded occurrences
Physical
Optical
- Optical type
- Uniaxial (+)
- Refractive index
- 1.812 – 1.824
- Surface relief
- Very high
- Principal indices
- nω 1.812 · nε 1.824
- UV response
- None
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation120 nm
Order1st order
XPL colour
Crystallography
- Morphology
Fibrous
- Type-locality form
Resinous masses attached tetradymite. The surfaces of the masses are either smooth, highly irregular, or pitted and cavernous.
- Comment
Tetragonal or hexagonal
Chemical composition
Synonyms
- IMA1983-062
- Yecoraiet
In other languages
- German
- IMA 1983-062 · Yecorait
- Italian
- Yecoraite
Classification
Strunz
10th ed.7.DF.70
- 7SulfatesClass
- 7.DSulfates (selenates, etc.) with additional anions, with H2ODivision
- 7.DFWith large and medium-sized cationsGroup
- 7.DF.70YecoraiteSpecies
Dana
8th ed.34.08.06.01
- 34Selenites, Tellurites and SulfitesClass
- 34.08Compound Selenites, Tellurites and SulfitesType
- 34.08.06— unnamed intermediate level —Group
- 34.08.06.01YecoraiteSpecies
CIM
—28.4.17
- 28Selenites, Selenates, Tellurites, and TelluratesClass
- 28.4TelluratesGroup
- 28.4.17YecoraiteSpecies
Literature, links & citation
Citations
- 1985Williams S A, Cesbron F P (1985) Yecoraite Fe3Bi5(TeO3)(TeO4)2O9·nH2O a new mineral from Sonora, Mexico. Boletín de Mineralogía 1, 10-16
- 1986Hawthorne, F.C., Bladh, K.W., Burke, E.A.J., Ercit, S., Grew, E.S., Grice, J.D., Puziewicz, J., Roberts, A.C., Schedler, R.A., Shigley, J.E. (1986) New mineral names. American Mineralogist: 71: 1543-1548.
- 2005(2005) Yecoraite. Handbook of Mineralogy. Mineralogical Society of America
- 2009Frost, Ray L., Keeffe, Eloise C. (2009) Raman spectroscopic study of the mixed anion mineral yecoraite Bi5Fe3O9(Te4+O3)(Te6+O4)2·9H2O. Journal of Raman Spectroscopy, 40 (9). 1117-1120 doi:10.1002/jrs.2195DOI: 10.1002/jrs.2195
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Yecoraite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/yecoraite-4358},
note = {Accessed 2026-05-11}
}