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ultrabasic rock

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

ultrabasic rock An igneous rock that consists almost entirely of ferromagnesian minerals and possesses no free quartz, and with less than 45% silica (SiO2). ‘Ultramafic’ is a partial synonym.

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