Where it forms, where it's found
- Geological setting
pegmatite
- Type locality
- Eduardo claim
- Barra do Cuieté
- Conselheiro Pena
- Minas Gerais
- Brazil
-19.0819°, -41.5100°
2recorded occurrences
Safety & handling
Physical
- Transparency
- Transparent
- Colour
- Pale to yellowish green
- Streak
- Pale to yellowish green
- Cleavage
- Distinct/Good
(010) (100)
- Density
- 2.934 g/cm³
Optical
- Optical type
- Biaxial (+)
- Notes
RI min=1.747 max=1.754
Crystallography
- Cell parameters
- a = 5.383(2) Å · b = 6.878(2) Å · c = 10.364(3) Å
- Cell angles
- α = 96.43(4) ° · β = 102.29(2) ° · γ = 109.17(3) °
- Ratio a:b:c
- 1 : 1.278 : 1.925
- Z
- 1
- Morphology
fibrous
- Type-locality form
Single crystals, up to 10 μm long with a thickness of about 1-2 μm, are elongated along [001] and flattened on (100).
Chemical composition
Synonyms
- Césarferreiraiet
- IMA2012-099
In other languages
- German
- Césarferreirait · IMA 2012-099
- Italian
- césarferreiraite
Classification
Strunz
10th ed.8.DC
- 8Phosphates, Arsenates, VanadatesClass
- 8.DPhosphates, etc. with additional anions, with H2ODivision
- 8.DCWith only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1Group
- 8.DCCésarferreiraiteSpecies
Group, growth & confusion
Literature, links & citation
Citations
- 2013Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 16. Mineralogical Magazine, 77 (6) 2695-2709 doi:10.1180/minmag.2013.077.6.01DOI: 10.1180/minmag.2013.077.6.01
- 2014Scholz, R., Chukanov, N. V., Filho, L. A. D. M., Atencio, D., Lagoeiro, L., Belotti, F. M., Chaves, M. L. S. C., Romano, A. W., Brandão, P. R., Belakovskiy, D. I., Pekov, I. (2014) Césarferreiraite, Fe2+Fe3+2(AsO4)2(OH)2·8H2O, from Eduardo mine, Conselheiro Pena, Minas Gerais, Brazil: Second arsenate in the laueite mineral group. American Mineralogist, 99 (4) 607-611 doi:10.2138/am.2014.4695 DOI: 10.2138/am.2014.4695
- 2017(2017) Césarferreiraite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Césarferreiraite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/cesarferreiraite-43865},
note = {Accessed 2026-05-11}
}