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Felsite definition

fĕlsīt
A fine-grained, light-colored igneous rock, composed chiefly of feldspar and quartz.
noun
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A light-colored, dense, fine-grained igneous rock consisting mainly of feldspar and quartz.
noun
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A fine-grained, light-colored igneous rock, consisting mainly of feldspar and quartz.
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(mineralogy) A fine grained volcanic extrusive rock, generally light in color, composed of felsic minerals.

The buff-colored dacites of the Superstition Mountains are felsites.

noun
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(geology) Any light-colored volcanic rock whose true mineralogy is not yet determined.
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Other Word Forms

Noun

Singular:
felsite
Plural:
felsites

Origin of felsite

  • fels(par) –ite

    From American Heritage Dictionary of the English Language, 5th Edition

Felsite Sentence Examples

  • These are penetrated by intrusions of granitic and felsitic character; one of these masses in Papa Stour is a handsome pink felsite.

  • Igneous rocks are not extensively developed; in Wales they form an important feature and occur in considerable thickness; they are represented by lavas of olivine-diabase and by contemporaneous tuffs which are traversed by later granite and quartz felsite.

  • Tertiary-aged dolerite and felsite dikes occur throughout the area and have a strike of NW-SE.

  • The orthoschists are white mica-schists produced by the shearing of acid rocks, such as felsite and porphyry.

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