mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white/gray; Luster: Vitreous (glassy); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white/gray
Luster: Vitreous (glassy)

Identified June 2, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white/gray; Luster: Vitreous (glassy); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Found in all types of geological environments; forms from cooling magma/lava, hydrothermal veins, or sedimentary accumulation. Can be found in rocks from virtually all geological ages.

Uses & applications

Extensively used in electronics (oscillators), glassmaking, abrasives, jewelry (as semi-precious stones), and as a primary component in construction sand/concrete.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it can generate an electrical charge when mechanical stress is applied.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage (it breaks in irregular, shell-like curves), and its glassy appearance. Extremely common worldwide in riverbeds and mountains.