Brown Quartzite Pebble

Physical Properties

Hardness: 7 (Mohs scale); Color: Brownish-red to tan; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.6-2.7. Extremely durable and abrasive-resistant.

Formation & Geological History

Formed through the metamorphism of quartz sandstone under intense heat and pressure. This specific specimen has been further shaped by fluvial (river) erosion, creating its smooth, rounded pebble shape.

Uses & Applications

Used as decorative stone in landscaping, aquarium gravel, and road aggregate. High-quality quartzite is used in construction as dimension stone or for countertops.

Geological Facts

Quartzite is so tough that it often breaks through the quartz grains rather than along the boundaries between them. It is one of the most physically and chemically resistant rocks found at the Earth's surface.

Field Identification & Locations

Identify in the field by its hardness (cannot be scratched by a steel blade) and its smooth, water-worn texture. Commonly found in riverbeds, glacial deposits, and mountain ranges where ancient sandstone was compressed.

Identified on: 4/30/2026

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