mineral

Quartz (Sand Grain size)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to yellowish/tan; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Clear to yellowish/tan
Luster: Vitreous (glassy)

Identified March 14, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to yellowish/tan; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the crystallization of molten magma or by precipitation from hydrothermal veins. This specific specimen appears to be a detrital grain, weathered from parent rock and transported by water or wind.

Uses & applications

In this small size, it is a component of industrial sand used in glassmaking, abrasives, and hydraulic fracturing. Large crystals are used in jewelry and electronics (piezoelectric properties).

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. It is highly resistant to both chemical and physical weathering, which is why it is the primary component of most beach sand.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage planes. Found globally in almost all geological environments. Collectors look for larger, well-formed 'Herkimer Diamonds' or druzy clusters.