Occurrence, isolation & synthesis

Bluish white metal. Very soft, inelastic and easily fusible [7].


In nature, thallium is found in the Earth's crust, 0.7 ppm, in minerals such as crookesite, lorandite and hutchinsonite [6]. The isotopes found in nature are 203Th (29.50 %, stable) and 205Th (70.50 %, stable) [6].

In pure solid form, thallium exist in a hexagonal close-packed structure [3].