Felsite sentence example

felsite
  • It is worthy of note that the dykes and sheets of felsite are seldom pierced by the basalt dykes and are probably about the most recent of the intrusive rocks.
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  • The orthoschists are white mica-schists produced by the shearing of acid rocks, such as felsite and porphyry.
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  • In the south of the island there are sills and dykes of felsite, quartz-porphyry, rhyolite, trachyte and pitchstone.
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  • The felsite sheets are well represented in Holy Island.
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  • These are penetrated by intrusions of granitic and felsitic character; one of these masses in Papa Stour is a handsome pink felsite.
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  • 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.
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  • Tertiary-aged dolerite and felsite dikes occur throughout the area and have a strike of NW-SE.
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  • felsite dike immediately on the coast.
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