Riverstone Quartzite

Physical Properties

Hardness: 7 (Mohs scale); Color: Tan, brown, and grey with iron-oxide staining; Luster: Dull to waxy; Texture: Granular, sugary appearance; Specific gravity: 2.6-2.7.

Formation & Geological History

Formed from the metamorphism of quartz-rich sandstone. High heat and pressure compressed the original sand grains into a dense rock. The rounded shape is a result of fluvial erosion in a riverbed.

Uses & Applications

Used as decorative landscaping stones, road aggregate, and construction material. High-quality quartzite is used for countertops and flooring.

Geological Facts

Quartzite is so hard and durable that it often survives the intense weathering processes that break down surrounding rocks into soil or clay.

Field Identification & Locations

Identify in the field by its inability to be scratched by a steel knife and its rounded, water-worn edges. It is extremely common in ancient and modern river deposits throughout the world.

Identified on: 4/19/2026

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