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A melanosome in geology refers to the dark, mafic mineral bands formed in migmatite which is undergoing eutaxitic melting; probably to form granite. These form bands with leucosomes and such a texture may be described as schlieren or migmatitic.
- Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks, Part 6. Migmatites and related rocks, p2. 
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