mineral

Clear Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Colorless/Transparent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Colorless/Transparent
Luster: Vitreous (glassy)

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Colorless/Transparent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal solutions or the cooling of magma in pegmatites. It can be found in all types of geological environments (igneous, metamorphic, and sedimentary) across billions of years of Earth's history.

Uses & applications

Used in electronics (oscillators), optics (glass making), construction (as glass or silica sand), and widely in jewelry and metaphysical collecting as 'Rock Crystal'.

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 pressure is applied, which is why it is used in watches and clocks.

Field identification & locations

Identify by its ability to scratch glass (Hardness 7), lack of cleavage, and transparent appearance. It is commonly found worldwide, notably in Brazil, Madagascar, and the USA (Arkansas). Collectors look for clarity and internal inclusions.