عنوان مقاله [English]
A variety of igneous rocks originating from the earth’s mantle contain primary diamond sources, which are the main host rocks for diamonds, kimberlites and lamproite. Primary diamonds or fake (graphite in place of diamonds), and also alkaline basalts and peridotites of Alpine Cumminsky type (1984) have been found in some lamprophyres; however, significant amounts of diamonds
have not yet been found in these stones.
Secondary diamond deposits come from these original source rocks affected by weathering and transportation. These deposits are usually rich in high quality diamonds. Examples of these include the Ural Mountains (the former Soviet Union), Namibian sea deposits and the West African,
Brazilian and Venezuelan river sediments.
The determination of rocks that have potential for these deposits is not possible through mineralogy of the existing debris phases. The nature and origin of secondary diamond deposits are not the subject of this discussion.