Quartz Pebble

Physical Properties

Hardness: 7 (Mohs scale), Color: White to creamy tan/off-white, Luster: Vitreous to waxy (when weathered), Crystal structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen is well-rounded, indicating it has undergone significant mechanical weathering and transport in a river or beach environment.

Uses & Applications

Commonly used in construction aggregate, landscaping, glass manufacturing, and as a raw material for electronic components. High-purity quartz is essential for semiconductor production.

Geological Facts

Quartz is the most abundant and widely distributed mineral found at Earth's surface. Rounded pebbles like this one are often referred to as 'river rocks' and have been smoothed by thousands of years of water erosion.

Field Identification & Locations

Identify in the field by its hardness (it should scratch glass easily) and its lack of cleavage. It is ubiquitous in riverbeds, glacial deposits, and along coastlines worldwide.

Identified on: 4/24/2026

Mode: Standard