mineral

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glass-like); Crystal structure: Hexagonal/Trigonal; Cleavage: Indistinct/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless/Transparent
Luster: Vitreous (glass-like)

Identified June 2, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glass-like); Crystal structure: Hexagonal/Trigonal; Cleavage: Indistinct/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. Occurs in all types of environments including igneous, metamorphic, and sedimentary rocks throughout geological history.

Uses & applications

Used in electronics (oscillators), glassmaking, abrasives, jewelry (as 'rock crystal'), and widely collected for metaphysical or decorative purposes.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. 'Rock crystal' specifically refers to the pure, transparent variety. It possesses piezoelectric properties, meaning it generates an electric charge under mechanical stress.

Field identification & locations

Identify by its six-sided prismatic shape ending in a pyramid (if intact), its ability to scratch glass, and lack of true cleavage (it breaks with curved edges). Found globably, with massive deposits in Brazil and Arkansas, USA.