| Lorandite | |
|---|---|
| General | |
| Category | Sulfosalt mineral |
| Chemical formula | TlAsS2 |
| Identification | |
| Color | red to carmine-red, lead grey |
| Crystal habit | Prismatic tabular striated parallel to [001] |
| Crystal system | Monoclinic prismatic 2/m |
| Cleavage | [100] perfect, [001] distinct |
| Fracture | Conchoidal |
| Mohs scale hardness | 2.0 - 2.5 |
| Luster | Sub metallic - adamantine |
| Streak | Cherry-red |
| Diaphaneity | Subtransparent |
| Specific gravity | 5.5288 - 5.5362 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 2.720 |
| Pleochroism | Weak; Y = purple-red; Z = orange-red |
| Other characteristics | Tenacity: flexible, forming cleavage lamellae and fibers |
| References | [1][2][3] |
Lorandite is a thallium arsenic sulfosalt with formula: TlAsS2. Though rare, it is the most common thallium bearing mineral. Lorandite occurs in low temperature hydrothermal associations. Occurs in gold and mercury ore deposits. Associated minerals include stibnite, realgar, orpiment, cinnabar, vrbaite, greigite, marcasite, pyrite, tetrahedrite, antimonian sphalerite, arsenic and barite.[1]
It was first discovered at the Alshar mine, near Kavadarci, Republic of Macedonia in 1894 and named after Loránd Eötvös, physicist at the University of Budapest.
   | Mindat - Lorándite: Lorándite mineral information and data. |
| | Webmineral - Lorandite Mineral Data |
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