How minerals are formed in igneous and metamorphic rocks?

In igneous and metamorphic rocks minerals may occur in the cracks, crvices, faults and joints. The smaller occurences are called veins and the larger are called lodes.In most cases they are formed when minerals in liquid / molten and gaseous forms are forced upward through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.

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