Quartzite is a hard, non-foliated metamorphic rock.
Кварцит - это твердая, неслоистая метаморфическая порода.
Definitions
A hard, metamorphic rock which was originally sandstone, characterized by its high quartz content and used in construction and for decorative purposes.
The countertops in the kitchen were made of quartzite, giving them a durable and elegant finish.