Rock Crystal Quartz Pebble

Physical Properties

Hardness: 7 (Mohs scale). Color: White to translucent with slight greenish or yellowish impurities. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Formation & Geological History

Formed through hydrothermal processes where silica-rich fluids cooled in veins or cavities. This specific piece is water-worn, indicating it was eroded from its primary source and tumbled in a river or coastline over thousands of years.

Uses & Applications

Common quartz is used in construction as aggregate, in glassmaking, and in electronics for its piezoelectric properties. This tumbled form is often used in garden landscaping, aquarium decor, or as pocket stones for collectors.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. These rounded specimens are often called 'river stones' and have been used since prehistoric times for making tools and later for various spiritual practices.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass and steel) and lack of cleavage. It is commonly found in riverbeds, glacial deposits, and beaches globally.

Identified on: 4/27/2026

Mode: Standard