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Lorándite

Lorándite is a thallium arsenic sulfosalt with the chemical formula: TlAsS₂. Though rare, it is the most common thallium-bearing mineral. Lorandite occurs in low-temperature hydrothermal associations and in gold and mercury ore deposits. Wikipedia
Cleavage: perfect,, distinct
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Prismatic tabular striated parallel to
Crystal system: Monoclinic
Formula (repeating unit): TlAsS2
IMA symbol: Lor
Optical properties: Biaxial (+)