Felsic

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun

1
A rock with such properties.
"The central part of this nepheline syenite is very white felsics with black mafics in it. The entire area contains many nepheline-bearing dike rocks, but almost all are gray or pink or even red due to the color in the felsics."

Adjective

1
Enriched in minerals predominantly composed of the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.
"Much of the southern half of the southeastern body is a mafic syenite, slightly more felsic than the shonkinite."

Synonyms

acidic acidic sialic silicic

Antonyms

Example

"Much of the southern half of the southeastern body is a mafic syenite, slightly more felsic than the shonkinite."

Etymology

Blend of feldspar + silica, + -ic.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.