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The crystals develop an interlocking texture with some of the trace minerals becoming completely surrounded by later forming crystals.

The mineral grains in these rocks can grow very large and are readily distinguished in hand samples.When burial pressures and temperatures get too great, the rocks melt completely, becoming new igneous rocks.To fully understand Gentry's hypothesis a basic background in geology, mineralogy, and radiation physics is helpful.Metamorphic rocks represent alterations of precursor sedimentary, igneous, or other metamorphic rocks.Through the cycles of burial, folding, faulting, and subduction of crustal plates, rocks get pushed and dragged down to depths where - under heat and pressure - changes take place.

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