The conditions that cause the deposition of minerals do not happen all over the Earth at the same time. Some mineral depositions are due to the meteorites hitting the earth from space. Some minerals are generated due to various environmental factors such as, pressure (altitude), heat, solar energy, etc . which leads to variations. Some minerals are deposited due to volcanic eruptions and later solidification of molten lava, which can be found in few places. The rotation of earth causes the molten core to move inside the earth and lead the flow to be uneven.