mineral

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Clear/Colorless
Luster: Vitreous

Identified July 18, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from silica-rich hydrothermal solutions or the cooling of magma in igneous rocks like granite. Found in environments spanning from metamorphic to sedimentary deposits over millions of years.

Uses & applications

Used in electronics (oscillators), optical instruments, jewelry, glassmaking, and metaphysical collections.

Geological facts

Quartz is the second most abundant mineral in Earth's crust. 'Rock crystal' was once believed by ancient Greeks to be ice that had frozen so hard it could never melt.

Field identification & locations

Identify by its hardness (scratches glass), lack of bubbles (unlike glass), and conchoidal fracture. Commonly found in riverbeds, mountains, and mines worldwide.