mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: typically white, tan, or smoky pink in river-worn forms; Luster: vitreous to waxy; Crystal structure: hexagonal/trigonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: typically white, tan, or smoky pink in river-worn forms
Luster: vitreous to waxy

Identified February 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen has been rounded by fluvial (river) or coastal erosion, likely over thousands to millions of years.

Uses & applications

Used in landscaping, construction as aggregate, glass manufacturing, and as tumbled stones for decoration or metaphysical collections.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its piezoelectric properties make it essential for manufacturing frequency control devices in watches and electronics.

Field identification & locations

Identify in the field by its hardness (it can scratch glass and steel) and lack of cleavage. Commonly found in riverbeds, beaches, and desert pavements worldwide.