noun
- Plural of felsite; fine-grained igneous rocks, typically light-colored, composed mainly of feldspar and quartz.
Usage: geology; technical
Examples
- Geologists identified several felsites in the rock samples collected from the mountain range.
- The felsites in this region are characterized by their fine crystalline structure.
- These felsites formed from the rapid cooling of magma near the Earth's surface.
- The quarry produces felsites that are used in construction materials.