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Oilfield Glossary
Oilfield Glossary
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felsic

1. adj. [Geology]
Pertaining to minerals or igneous rocks composed of minerals such as quartz and feldspar that are relatively light in color and density. The word comes from the terms feldspar and silica. Granite is a felsic igneous rock. (Compare with mafic.)
Antonyms: mafic
See: mineral, silica