mineral

Quartz / Common Gravel

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to translucent tan, Luster: Vitreous to dull (weathered), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture)

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to translucent tan, Luster: Vitreous to dull (weathered), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture)

Formation & geological history

Formed through hydrothermal processes, igneous crystallization, or as weather-resistant fragments in sedimentary deposits. These specimens look like common clastic surface gravel.

Uses & applications

Common gravel is used extensively in construction, road base, and as decorative landscaping material. Pure quartz is used in glassmaking and electronics.

Geological facts

Quartz is the most abundant and widely distributed mineral found at Earth's surface. It is highly resistant to both chemical and mechanical weathering.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel blade) and lack of cleavage. Found globally in almost all geological environments.