If crystals already established in the ground find themselves being superheated and squeezed by local volcanic or tectonic activity, they tend to transform their atomic lattice structure from the inside out to accommodate the changes in their environment. Sometimes new minerals migrate from elsewhere into the transforming crystals, this is called Metasomatism.
Here we see layers of rock being pressed downwards by the formation of mountains. Where the rock enters the hot mantle the temperatures can rise extremely high but the pressures acting upon the rock prevent it from expanding into a molten liquid state. These forces cause the rock to change its’ atomic structure from the inside outwards. This is how Metamorphic rocks and minerals are formed. After many millions of years of natural cyclical upheavals in the crust, these crystals can be thrust upwards and exposed to the surface.
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