mineral

Quartz (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to pale yellow/smokey; Luster: Vitreous; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Clear to pale yellow/smokey
Luster: Vitreous

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to pale yellow/smokey; Luster: Vitreous; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids or cooling magma. This specific specimen appears to be water-worn, likely from an alluvial or beach deposit, smoothing its once-jagged edges over time.

Uses & applications

Used in jewelry, watch manufacturing, high-tech electronics, and as a popular collector's mineral due to its abundance and beauty.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge in response to mechanical stress, which is why it's used in clocks.

Field identification & locations

Identify by its hardness (it can scratch glass) and lack of cleavage. Look for it in riverbeds, mountains, or sandy areas. Tumbled pieces like this are common in rock shops and beachcombing.