sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: light brown, tan, or grey due to surface staining; Luster: vitreous to dull; Crystal structure: trigonal; Cleavage: none; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: light brown, tan, or grey due to surface staining
Luster: vitreous to dull

Identified August 3, 2026More sedimentary →

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Physical properties

Hardness: 7 on Mohs scale; Color: light brown, tan, or grey due to surface staining; Luster: vitreous to dull; Crystal structure: trigonal; Cleavage: none; Specific gravity: 2.65

Formation & geological history

Formed through the weathering and erosion of quartz-bearing rocks like granite or pegmatite, followed by transportation via water and deposition in sedimentary environments, lasting over millions of years

Uses & applications

Used in landscaping, aggregate for construction, abrasive materials, and glassmaking

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, which allows small pebbles to survive transport over vast distances

Field identification & locations

Can be identified in the field by its high hardness (scratches glass) and conchoidal fracture. Common in riverbeds, beaches, and alluvial deposits worldwide