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Szomolnokite
A valid IMA mineral species - grandfathered
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Colour:
Pale yellow or reddish-brown, may also be light blue, very pale greenish white to white, rarely pink due to cobalt
Lustre:
Resinous, Greasy, Dull
Hardness:
2½
Specific Gravity:
3.03 - 3.07
Crystal System:
Monoclinic
Member of:
Name:
Named by Joseph Krenner in 1877 for the type locality, at Szomolnok, Slovakia (formerly Hungary).
Type Locality:
A common alteration product of iron sulphides (pyrite,marcasite,pyrrhotite).
Forms a complete solid solution withkieserite (Talla and Wildner, 2019).
End-member szomolnokite, FeSO4·H2O, is monoclinic, and synthetic CuSO4·H2O is triclinic. The cell-parameter refinements of (Fe,Cu)SO4·H2O compounds show a reduction in symmetry from monoclinic to triclinic beyond 20 mol% Cu. By Mössbauer spectroscopy significant ordering involving the cations can be observed only in members of the solid solution with more than 20 mol% Cu. Site ordering is characterized by a preference of ferrous iron for the less distorted site (Giester et al., 1994).
Forms a complete solid solution withkieserite (Talla and Wildner, 2019).
End-member szomolnokite, FeSO4·H2O, is monoclinic, and synthetic CuSO4·H2O is triclinic. The cell-parameter refinements of (Fe,Cu)SO4·H2O compounds show a reduction in symmetry from monoclinic to triclinic beyond 20 mol% Cu. By Mössbauer spectroscopy significant ordering involving the cations can be observed only in members of the solid solution with more than 20 mol% Cu. Site ordering is characterized by a preference of ferrous iron for the less distorted site (Giester et al., 1994).
![FeSO4 · H2O](#"/photo-843469.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f98%2f01%2f01085960017271927083112.jpg&f=jpg&w=240" alt="01085960017271927083112.jpg" /></a><div><b>View of the Smolník polymetallic mining area, in 1905.</b><br /><br /><a href="/mt/?noimg=&dark=on&url=https%3a%2f%2fwww.mindat.org%2floc-123560.html">Smolník mining district, Gelnica District, Košice Region, Slovakia</a></div></div></div><div><div><span>Formula:</span><div class=){kind=link}