| Szomolnokite | |
|---|---|
 Halotrichite (Hal); szomolnokite (Szo) and voltaite (Vol) | |
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) | FeSO4 · H2O |
| IMA symbol | Szo |
| Strunz classification | 7.CB.05 |
| Dana classification | 29.6.2.2 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) |
| Space group | C2/c (no. 15) |
| Identification | |
| Color | Sulfur-yellow, yellow-brown, red-brown, blue, colorless |
| Crystal habit | Bipyramidal, distorted, tabular, parallel growths, globular, stalactites |
| Fracture | Conchoidal to sub-conchoidal, uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 2.5 |
| Luster | Vitreous |
| Diaphaneity | Translucent |
| Specific gravity | 3.03–3.07 (measured), 3.10 (calculated) |
| Optical properties | Biaxial (+), colorless (transmitted light) |
| 2V angle | 80° (measured), 86° (calculated) |
| References | |
Szomolnokite (FeSO4·H2O) is a monoclinic iron sulfate mineral forming a complete solid solution with magnesium end-member kieserite (MgSO4·H2O). In 1877 szomolnokite's name was derived by Joseph Krenner from its type locality of oxidized sulfide ore containing iron in Szomolnok, Slovakia (Hungary at the time).
As of mid-January 2020 the only continent on which szomolnokite has not been found and reported is Antarctica.
At room temperature szomolnokite is stable up to a pressure of 6.2 GPa, and then transforms into triclinic crystal structure.
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Mindat.org - Szomolnokite
- ^ Webmineral - Szomolnokite
- ^ Handbook of Mineralogy - Szomolnokite
- Wildner, M.; Giester, G. (1991). "The crystal structures of kieserite-type compounds. I. Crystal structures of Me(II)SO4*H2O (Me = Mn,Fe,Co,Ni,Zn)". Neues Jahrbuch für Mineralogie - Monatshefte. 1991: 296–306.
- Meusburger, J. M.; Ende, M.; Talla, D.; Wildner, M.; Miletich, R. (2019-09-01). "Transformation mechanism of the pressure-induced C2/c-to-P1¯ transition in ferrous sulfate monohydrate single crystals". Journal of Solid State Chemistry. 277: 240–252. doi:10.1016/j.jssc.2019.06.004. ISSN 0022-4596. S2CID 197070809.
Bibliography
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 479–480.
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