Semseyite
A variety of Plagionite Group
What is Semseyite?
Semseyite is a rare mineral with a grey-ish black appearance. This mineral was named after Andor von Semsey who was an amateur mineralogist in Hungary. Semseyite is a brittle mineral. It is present at high temperatures in hydrothermal conditions and is usually found near volcanic activity.
Etymology & Origins
Semseyite was first described for an occurrence in the Felsöbánya mine in Baia Sprie, Romania in 1881 by József Sándor Krenner (1839–1920). The mineral was named after Hungarian mineralogist Andor von Semsey (1833–1923).
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Key Characteristics
Formation of Semseyite
Semseyite forms in hydrothermal solutions at temperatures between 300 and 350 °C. It occurs in association with bournonite, jamesonite, sphalerite, zinkenite, sorbyite, guettardite, jordanite, diaphorite, galena, pyrite, chalcopyrite, tetrahedrite, arsenopyrite and siderite.
Health & Safety Information
- ⚠️Harm Reason: Semseyite dust is toxic because it contains heavy metals Lead, Antimony.
- ⚠️Heavy Metal: Lead, Antimony
- ⚠️How to prevent the risks of Semseyite?
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Quick Facts
Physical Properties
- Color
- Steel-grey to black
- Hardness (Mohs)
- 2.5
- Density
- 6.15 g/cm³
- Streak
- Black
- Luster
- Metallic
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- Pb9Sb8S21
- Elements
- Pb, S, Sb
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