mineral

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

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

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

Identified April 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal solutions or the cooling of magma in igneous rocks; often found in veins and geodes. It crystals can grow over millions of years in various geological environments.

Uses & applications

Used in electronics (oscillators), optics, glass manufacturing, abrasives, jewelry (gemstones), and widely collected for metaphysical or decorative purposes.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These specific well-formed crystals are often called 'Rock Crystal' when perfectly clear.

Field identification & locations

Identify by its six-sided prismatic crystals ending in a pyramid, its ability to scratch glass but not be scratched by steel, and its lack of cleavage. Common in mountains and river beds worldwide.