Quartz pebble with surface markings

Physical Properties

Hardness: 7 on Mohs scale; Color: Creamy white to pale yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture.

Formation & Geological History

Formed from silica-rich hydrothermal fluids or cooling magma. This particular specimen is a water-worn river or beach pebble, shaped by mechanical erosion over time.

Uses & Applications

Common quartz is used in construction as aggregate, in glassmaking, as an abrasive, and frequently by hobbyists for rock tumbling and painting.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. This specific specimen appears to have modern teal/green ink or paint markings on its surface, indicating it was likely used as a 'kindness stone' or a craft project.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent appearance. It is found globally in almost all geological environments.

Identified on: 4/15/2026

Mode: Standard