quartzite
/ˈkwɔrtsaɪt/
noun
- A hard, non-foliated metamorphic rock made mostly of quartz, often used in construction and as a decorative stone.
- Quartzite is popular for outdoor paving because it resists weathering.
- The countertops in the kitchen are made of polished quartzite.
- Hikers often see quartzite boulders along the mountain trail.