mineral

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Colorless to white
Luster: Vitreous (glass-like)

Identified March 28, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich magma or via hydrothermal activity in veins. Can be found in almost any geological age, predominantly in igneous and metamorphic environments.

Uses & applications

Used extensively in glass making, electronics (piezoelectric oscillators), construction (sand/aggregate), jewelry (gemstones), and decorative healing crystals.

Geological facts

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

Field identification & locations

Identify in the field by its hardness (cannot be scratched by steel), glassy luster, and lack of cleavage. Common in riverbeds, mountains, and desert surfaces worldwide.

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Sandstone (with potential mineral staining/concretions)

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Mineral/Rock

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