mineral

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous to dull

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the cooling of magma or hydrothermal precipitation. These small pebbles are typically found as detrital material in sedimentary environments after weathering from igneous or metamorphic host rocks.

Uses & applications

Common quartz is used in construction as aggregate, in glassmaking, and in electronics for its piezoelectric properties. These small specimens are mostly of interest to beginner collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as small pebbles in sand and gravel.

Field identification & locations

Identify in the field by its hardness (it can scratch glass) and lack of cleavage. Found globally in riverbeds, beaches, and soil. Collectors look for clearer or larger crystals.