Lorándite
A variety of Minerals
What is 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. Associated minerals include stibnite, realgar, orpiment, cinnabar, vrbaite, greigite, marcasite, pyrite, tetrahedrite, antimonian sphalerite, arsenic and barite. The mineral is being used for detection of solar neutrino via a certain nuclear reaction involving thallium. It has a monoclinic crystal structure consisting of spiral chains of AsS3 tetrahedra interconnected by thallium atoms, and can be synthesized in the laboratory.
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Key Characteristics
Composition of Lorándite
The crystal structure of lorandite is monoclinic, space group P21/a, Z = 4, with the lattice constants a = 1.228 nm, b = 1.130 nm, c = 0.6101 nm and β = 104.5 °. It consists of spiral chains of AsS3 tetrahedra oriented to the [010] crystal axis. The chains are covalently interlinked by irregularly coordinated Tl atoms (chain interconnections not shown in the picture), and breaking of these links is responsible for crystal cleavage.
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Quick Facts
Physical Properties
- Color
- Cochineal- to carmine-red; often dark lead-gray on the surface and frequently coated by an ochre-yellow powder.
- Hardness (Mohs)
- 2 - 2.5
- Density
- 5.53 g/cm³
- Streak
- Cherry-red
Chemical Properties
- Chemical Formula
- TlAsS2
- Elements
- As, S, Tl
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