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铊在自然界中主要呈分散狀态存在,在各种地質体內它的含量一般为十万分之几至百万分之几。铊的矿物在自然界中发現非常少:如紅铊矿TlAsS_2、輝铊锑矿(TlAs_2SbS_5)、硫砷坨鉛矿(Pb,Tl)(Cu,Ag)As_5S_(10)和硒铊銀銅矿(Cu,Tl,Ag)_2Se。前两种矿物常与砷、銻的硫化物及鉄的胶狀二硫化物共生,硫砷蛇鉛矿則与各种硫砷化物和硫輝銻矿以及铅、鋅和砷的硫化物共生。对少数铊矿物的共生組合研究后指
Thallium is mainly present in the dispersed state in nature, and its content in various geological bodies is generally a few parts per million to a few parts per million. Thallium minerals are found in nature to be very small: such as TlAsS_2, TlAs_2SbS_5, Pb, Tl (Cu, Ag) As_5S_ (10) and selenium thallium Ag-Cu deposit (Cu, Tl, Ag) _2Se. The first two minerals are often symbiotic with arsenic, antimony sulfide, and stilbene disulfide. Sulfur arsenic snake lead coexists with various sulfur arsenide and stibnites as well as lead, zinc and arsenic sulfide. Research on the symbiotic combination of a few thallium minerals means later