Quartz Pebble

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & Geological History

Formed from cooling silica-rich hydrothermal fluids or within igneous and metamorphic environments. This specimen has been rounded and smoothed by water erosion (fluvial or beach action) over thousands of years.

Uses & Applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscaping stones or river rocks.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which had a Slavic origin meaning 'hard'.

Field Identification & Locations

Identify by its hardness (cannot be scratched by steel) and smooth, water-worn texture. It is extremely common in riverbeds, beaches, and glacial deposits worldwide.

Identified on: 5/15/2026

Mode: Standard