Might mean (unverified): Rocks containing very high magnesium.
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We found one dictionary that defines the word ultramaphic:

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  1. ultramaphic: Wiktionary

Definitions from Wiktionary (Ultramaphic)

adjective:  Alternative form of ultramafic [(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.]

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