Lorandite
7 in the gallery
Lorandite is a sulfosalt mineral with the chemical formula TlAsS2. It typically forms as metallic to submetallic crystals and masses with a resinous to silky luster and a dark, lead-gray appearance. The mineral commonly occurs in hydrothermal vein systems and is often associated with other thallium, arsenic, and sulfide minerals, which helps identify its distinctive paragenesis. Specimens from notable localities display sharp crystal forms or well-developed crusts on matrix, highlighting its prominence in epitaxial and cabinet-sized collections.
- Formula
- TlAsS2
Where Lorandite is found
About Lorandite
Collectors prize lorandite for its rarity and its association with notable European and North American localities. Specimens preserving lustrous, sharp crystals or intricate aggregates from historic and classic mining districts are especially sought after. Its connection to thallite-rich and arsenic-rich assemblages adds to its appeal for display and study, offering a window into hydrothermal sulfide mineralogy and the complex chemistry of thallium-bearing systems.