FeSO · H
Szomolnokite, a member of the kieserite group, is rare at Mont Saint-Hilaire.
Color is usually white or yellow.
Luster is vitreous.
Diaphaneity is translucent.
Crystal System is monoclinic; 2/
Crystal Habits include thin crusts and coatings on pyrrhotite.
Cleavage none observed.
Fracture is conchoidal to uneven.
Hardness is 2.5
Specific Gravity is approximately 3.05 g/cm
Streak is white.
Associated Minerals include amphibole group, garnet group,
microcline, pyrite, pyrrhotite, siderite and sphalerite.
Distinguishing Features: None from white powdery species.
Origin: Named in 1877 after its discovery locality, Szomolnok, Slovakia.
MinRec 21:341 (1990), Dana 8:596 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE: