Explanation

Relict structure. It refers to that in metamorphic rock, due to incomplete recrystallization, some or all of the structural characteristics of the original rock remain. According to the original rock structure, it can be further divided into meta residual gravel structure, meta residual sand structure, meta residual porphyritic texture, meta residual green structure, meta residual pyroclastic structure, meta residual granite structure, etc. According to the palimpsest texture, the original rock type of metamorphic rock can be restored.

Classification