ABSTRACT: This article is an attempt to summarize the geologic environments for nickel deposits and parageneses with which nickel is associated; thus 14 types of nickel deposits are defined. On the other hand the nickel potential of Turkey is investigated concluding seven different types of nickel concentration can be expected. These are put in order of importance according to geologic and metallogenic data of Turkey. Nickel is mainly found in ultramafic rocks and their alteration products namely lateritic iron deposits. In addition acid plutonic rocks play a part in formation of nickel deposits Turkey is very likely to beara high nickel potential as large areas are covered by ultrabasic and acid plutonic rocks. Emphasis is also laid upon asphaltites covering an area of 20.000 square km. containing 3,2 kg. of Ni in one ton of asphaltite ash and other valuable minor products such as Mo and V and the recovery of such minor products.