mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or colorless with vitreous to greasy luster, hexagonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.

Identified August 5, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or colorless with vitreous to greasy luster, hexagonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.

Formation & geological history

Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks, often precipitating from hydrothermal veins or crystallizing from silica-rich magma.

Uses & applications

Used widely in glassmaking, electronics, oscillators, gemstones, abrasive materials, and ornamental carvings.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electric charge under mechanical stress.

Field identification & locations

Easily identified in the field by its high hardness (scratches glass easily), lack of cleavage, and characteristic conchoidal fracture. Found worldwide.