The neosome is composed of lightly-colored areas ( leucosome ) and dark areas ( melanosome ).
2.
The melanosome is composed of cordierite, hornblende and biotite and forms the wall zones of the neosome.
3.
When a rock undergoes partial melting some minerals will melt ( neosome, i . e . newly formed ), while others remain solid ( paleosome, i . e . older formation ).
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