mineral

Quartz crystal cluster

Quartz, SiO₂; likely a drusy quartz cluster with small prismatic crystals

AI-generated identification · may be incorrect

Colorless to milky-white, transparent to translucent, with a vitreous luster and hexagonal crystal habit. Mohs hardness 7; no cleavage and uneven to conchoidal fracture; specific gravity about 2.65. A small tan inclusion is visible, but its identity cannot be determined from the image.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids in cavities and fractures, sometimes coating a rock surface with fine drusy crystals. Quartz occurs in rocks of many ages; the specimen’s age and exact formation setting cannot be determined visually.

Uses & applications

Quartz is widely used in glass, electronics, abrasives, and construction; attractive clusters are collected or displayed as mineral specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a trigonal crystal structure, commonly expressed as six-sided prisms with pointed terminations.

Field identification & locations

Look for glassy luster, pointed hexagonal crystals, and hardness sufficient to scratch ordinary glass. Quartz clusters are common worldwide, including Brazil, Uruguay, the United States, and Madagascar.