Why minerals in both metamorphic and igneous rocks are the same ? State the reasons.

(i)Since magma is the chief source of metal ores, many of them, are associated with igneous rocks e.g., magnetic iron, nickel, copper, lead, zinc, chromite, manganese, gold, diamonds, platinum, etc.
(ii)All igneous rocks are also of magnetic origin. Granite is an igneous rock formed from magma which cools down and solidifies at moderate depths beneath the earth's surface.
(iii)Metamorphic rocks are changed rocks due to heat and pressure or as result of contact with a hot igneous material. The change takes place at depth of about 12-16 km below the earth's surface. These rocks are formed under conditions similar to those producing igneous rocks. Ores of copper, zinc, lead, quartz, feldspar, mica are the results of contact metamorphism. Gold, diamond and platinum are also found in metamorphic rocks.
Hence the minerals in both metamorphic and igneous rocks are almost the same.