Szomolnokite Explained
| Szomolnokite |
| Category: | Sulfate mineral |
| Formula: | Fe2+SO4 · H2O |
| Imasymbol: | Szo[1] |
| Strunz: | 7.CB.05 |
| Dana: | 29.6.2.2 |
| System: | Monoclinic |
| Class: | Prismatic (2/m) |
| Symmetry: | C2/c (no. 15) |
| Color: | Sulfur-yellow, yellow-brown, red-brown, blue, colorless |
| Habit: | Bipyramidal, distorted, tabular, parallel growths, globular, stalactites |
| Fracture: | Conchoidal to sub-conchoidal, uneven |
| Tenacity: | Brittle |
| Mohs: | 2.5 |
| Luster: | Vitreous |
| Opticalprop: | Biaxial (+), colorless (transmitted light) |
| 2V: | 80° (measured), 86° (calculated) |
| Gravity: | 3.03–3.07 (measured), 3.10 (calculated) |
| Diaphaneity: | Translucent |
| References: | [2] |
Szomolnokite (Fe2+SO4·H2O) is a monoclinic iron sulfate mineral forming a complete solid solution with magnesium end-member kieserite (MgSO4·H2O).[3] 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).[3] [4] [5]
As of mid-January 2020 the only continent on which szomolnokite has not been found and reported is Antarctica.[3]
At room temperature szomolnokite is stable up to a pressure of 6.2 GPa, and then transforms into triclinic crystal structure.[6]
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.
Notes and References
- Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
- Wildner . M. . Giester . G. . Neues Jahrbuch für Mineralogie - Monatshefte . 1991 . 1991 . 296–306 . The crystal structures of kieserite-type compounds. I. Crystal structures of Me(II)SO4*H2O (Me = Mn,Fe,Co,Ni,Zn).
- http://www.mindat.org/min-3859.html Mindat.org - Szomolnokite
- http://webmineral.com/data/Szomolnokite.shtml Webmineral - Szomolnokite
- http://www.handbookofmineralogy.com/pdfs/szomolnokite.pdf Handbook of Mineralogy - Szomolnokite
- 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 . en . 277 . 240–252 . 10.1016/j.jssc.2019.06.004 . 197070809 . 0022-4596.
