Answer :
In Igneous and metamorphic rocks minerals occurs in cracks, crevices, faults, or joints.They are formed whenmolten(liquid or gaseous form of lava are forced upwards through the cavities towards the earth's surface. They cool and solidify as they rise. This lava convert into minerals.
Minerals may be found in the cracs, crevic, joints in igneous and metamorphic rocks.
The smaller occurences are called veins and the larger loades. They are formed when mineral in liquid and gaseous forms are forced upward through cavities towards the earth surface. Some major minerals are tin, copper, zinc and lead etc.
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