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To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating.

Radiometric dating is largely done on rock that has formed from solidified lava.

The following quote from The Earth: An Introduction to Physical Geology by Tarbuck & Lutgens, pp.

55-57, (1987), gives us an idea of the tremendous complexity of the processes that occur when magma solidifies.

This left branch is called a discontinuous reaction series because each mineral has a different crystalline structure.