Quartz Pebble

Physical Properties

Hardness: 7 (Mohs scale), Color: White to semi-translucent, Luster: Vitreous to waxy (when river-worn), Crystal structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within igneous/metamorphic rocks. This specific specimen has been shaped and smoothed through mechanical weathering and erosion in a high-energy aquatic environment like a riverbed or beach.

Uses & Applications

Used as decorative landscaping stone, in construction aggregates, as a source for glass manufacturing, and as tumbled stones for decorative or spiritual purposes.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its high hardness prevents it from wearing down as quickly as other minerals, which is why quartz pebbles often dominate riverbeds.

Field Identification & Locations

Identify by its ability to scratch glass (hardness 7) and lack of cleavage planes. Its rounded 'potato' shape indicates long-distance water transport. Can be found worldwide in almost any gravel pit or stream.

Identified on: 4/15/2026

Mode: Standard