Quartz Pebble

Physical Properties

Hardness: 7 on Mohs scale; Color: Creamy white to translucent; Luster: Vitreous to waxy (weathered); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within igneous pegmatites. This specimen has been rounded by fluvial (water) erosion in a river or stream bed, likely over thousands of years.

Uses & Applications

Industrial uses include glassmaking, electronics, and abrasives. In this rounded form, they are primarily used for landscaping, decorative gravel, or as pocket stones/charms.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz' and it was historically believed to be permanently frozen ice.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. Look for smooth, water-worn surfaces and a consistent white or milky color in gravel beds or along shorelines.

Identified on: 5/1/2026

Mode: Standard