Quartzite Pebble

Physical Properties

Hardness: 7 (Mohs scale), Color: Gray to brownish with translucent areas, Luster: Vitreous to dull, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None, Fracture: Conchoidal

Formation & Geological History

Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specimen has been further shaped by water erosion in a river or coastal environment, resulting in its smooth, rounded 'pebble' form.

Uses & Applications

Used as decorative gravel in landscaping, as an abrasive in industrial applications, or as high-quality aggregate in construction. Smooth beach stones are also popular for crafts and stress-relieving stones.

Geological Facts

Quartzite is one of the most durable rocks on the surface of the Earth. If you find a smooth, hard pebble that can scratch glass and does not fizz with acid, it is almost certainly a quartz-based rock like quartzite.

Field Identification & Locations

Identified by its high hardness, smooth texture due to water erosion, and lack of visible grains. It is commonly found in riverbeds, glacial deposits, and along beaches.

Identified on: 5/3/2026

Mode: Standard