Szomolnokite | |
---|---|
General | |
Category | Sulfate mineral |
Formula (repeating unit) | Fe2+SO4 · H2O |
IMA symbol | Szo [1] |
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 | [2] [3] [4] [5] |
Szomolnokite (Fe2+SO4·H2O) is a monoclinic iron sulfate mineral forming a complete solid solution with magnesium end-member kieserite (MgSO4·H2O). [2] 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). [2] [3] [4]
As of mid-January 2020 the only continent on which szomolnokite has not been found and reported is Antarctica. [2]
At room temperature szomolnokite is stable up to a pressure of 6.2 GPa, and then transforms into triclinic crystal structure. [6]
Szomolnokite | |
---|---|
General | |
Category | Sulfate mineral |
Formula (repeating unit) | Fe2+SO4 · H2O |
IMA symbol | Szo [1] |
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 | [2] [3] [4] [5] |
Szomolnokite (Fe2+SO4·H2O) is a monoclinic iron sulfate mineral forming a complete solid solution with magnesium end-member kieserite (MgSO4·H2O). [2] 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). [2] [3] [4]
As of mid-January 2020 the only continent on which szomolnokite has not been found and reported is Antarctica. [2]
At room temperature szomolnokite is stable up to a pressure of 6.2 GPa, and then transforms into triclinic crystal structure. [6]