mineral

Tumbled Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Clear to translucent smoky grey, Luster: Vitreous, Crystal structure: Trigonal, Cleavage: None/Conchoidal fracture.

Identified July 16, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Clear to translucent smoky grey, Luster: Vitreous, Crystal structure: Trigonal, Cleavage: None/Conchoidal fracture.

Formation & geological history

Quartz forms from cooling magma or hydrothermal veins. This specimen shows signs of mechanical tumbling or alluvial wear, likely found in riverbeds or ocean beaches.

Uses & applications

Commonly used in jewelry, decorative gemstone collections, and industrial glass production. Tumbled stones are often used in metaphysical practices and crystal healing.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the Greek word 'krustallos', meaning 'ice'.

Field identification & locations

Identify in the field by its hardness (scratches glass) and conchoidal (glass-like) fracture. Commonly found in most geological environments worldwide.