Abstract: The authors preliminarily summarized 56 thallium minerals reported in literatures up to now. A list of these minerals, which has been classified as six categories, is given as a table and the crystal chemistry and geochemistry features of thallium minerals are reviewed. In low temperature and reductive environment, thallium belongs to sulfophile element, and forms thallium minerals with elements such as As, Sb, Pb, Hg, Cu and Au in two forms:①Tl_wB_yS_z（thallium is the only metal element)，②TlTl_wA_xB_yS_z（(thallium isn’t the only metal element). Most thallium minerals occur in base metal deposits in the lowtemperature metallogenic province. The problems concerning the further studies of thallium mineralogy and geochemistry are also briefly discussed.

Key words: thallium, thallium minerals, dispersed elements, geochemistry