Thallium(I) sulfide
Chemical compound
Thallium(I) sulfide, Tl₂S, is a chemical compound of thallium and sulfur.
It was used in some of the earliest photo-electric detectors by Theodore Case who developed the so-called thalofide cell, used in early film projectors. Wikipedia
Formula: Tl2S
Molar mass: 440.833 g/mol
Boiling point: 2,493°F (1,367°C)
Melting point: 838.4°F (448°C)
Density: 8.39 g/cm³
Crystal structure: Trigonal, hR81
Formula units (Z): 27