felsite
/ˈfɛlsaɪt/
noun
- A fine-grained, light-colored igneous rock composed mainly of feldspar and quartz.
- The hiker picked up a piece of felsite that had a smooth, glassy texture.
- Ancient tools were sometimes made from felsite because it can be chipped into sharp edges.
- The cliff face was made of felsite, giving it a pale gray appearance.