Where it forms, where it's found
- Type locality
- Cornwall
- England
- UK
6recorded occurrences
Safety & handling
Physical
Optical
- Optical type
- Isotropic
- Birefringence
- Anomalous birefringence with nmin = 1.690(2) and nmax = 1.692(2)
- UV response
- Not fluorescent
PPL intrinsic colour; no change on stage rotation
XPL extinct at every orientation
Crystallography
- Space group
- P-4 3m
- Cell parameters
- a = 7.9587(2) Å
- Type-locality form
A single yellowish green, slightly elongated cube, 0.17 mm in size.
Crystal structure
Chemical composition
Synonyms
- Hydroniumpharmacosideriet
- IMA2010-014
In other languages
- German
- Hydroniumpharmakosiderit · IMA 2010-014
- Italian
- hydroniumpharmacosiderite
Classification
Strunz
10th ed.8.DK.10
- 8Phosphates, Arsenates, VanadatesClass
- 8.DPhosphates, etc. with additional anions, with H2ODivision
- 8.DKWith large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1Group
- 8.DK.10HydroniumpharmacosideriteSpecies
Dana
8th ed.42.08.1a.04
- 42Hydrated Phosphates, Etc.containing Hydroxyl or HalogenClass
- 42.08(AB)5(XO4)3Zq·xH2OType
- 42.08.1a— unnamed intermediate level —Group
- 42.08.1a.04HydroniumpharmacosideriteSpecies
Group, growth & confusion
BariopharmacosideriteBa0.5Fe3+4(AsO4)3(OH)4 · 5H2OMineral—- CaesiumpharmacosideriteCsFe4[(AsO4)3(OH)4] · 4H2OMineral—
NatropharmacosideriteNaFe3+4(AsO4)3(OH)4 · 4H2OMineral—
PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OMineral—- PlumbopharmacosideritePb0.5Fe3+4(AsO4)3(OH)4 · 5H2OMineral—
- StrontiopharmacosideriteSr0.5Fe4[(AsO4)3(OH)4] · 4H2OMineral—
- ThalliumpharmacosideriteTlFe4[(AsO4)3(OH)4] · 4H2OMineral—
Literature, links & citation
Citations
- 2010Mills, S. J., Hager, S. L., Leverett, P., Williams, P. A., Raudsepp, M. (2010) The structure of H3O+-exchanged pharmacosiderite. Mineralogical Magazine, 74 (3) 487-492 doi:10.1180/minmag.2010.074.3.487DOI: 10.1180/minmag.2010.074.3.487
- 2010Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) New minerals and nomenclature modifications approved in 2010. CNMNC Newsletter No 3. Mineralogical Magazine, 74 (3) 577-579 doi:10.1180/s0026461x00054979 DOI: 10.1180/s0026461x00054979
- 2010Mills, S. J., Kampf, A. R., Williams, P. A., Leverett, P., Poirier, G., Raudsepp, M., Francis, C. A. (2010) Hydroniumpharmacosiderite, a new member of the pharmacosiderite supergroup from Cornwall, UK: structure and description. Mineralogical Magazine, 74 (5) 863-869 doi:10.1180/minmag.2010.074.5.863 DOI: 10.1180/minmag.2010.074.5.863
- 2015(2015) Hydroniumpharmacosiderite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Hydroniumpharmacosiderite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/hydroniumpharmacosiderite-40152},
note = {Accessed 2026-05-11}
}