Pyrrhotite, copper pyrites and other sulphide ores may separate from the magma at an early stage to form irregular bodies which may also give rise to substantial ore deposits. In magmas very rich in iron and phosphorus, the iron may separate out early and sink to the bottom of the magma chamber to form large masses of magnetite with apatite. The mineral assemblages formed during early crystallisation are invariably characterised by an abun¬dance of iron and magnesium ores and a scarcity of silica—feldspar often being completely absent. It is possible to get a number of more or less distinct mineral assemblages if, during the early stages of crystallisation, the liquid magma is squeezed out of the mesh of crystals and moves elsewhere to crystallise into a separate igneous body.
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