mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely clear or milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; colorless to milky white, with vitreous luster and transparent-to-translucent crystals. Hexagonal crystal structure, typically lacking cleavage and showing conchoidal fracture; specific gravity about 2.65.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or late-stage cavities in igneous rocks precipitate quartz, commonly in geodes and mineral veins. The specimen’s exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used for gemstones, mineral collecting, glass, electronics, and industrial silica. Attractive clusters have modest decorative and display value.

Geological facts

Quartz commonly forms six-sided prismatic crystals ending in pyramidal points, though this cluster appears dominated by irregular or broken crystal faces. Its apparent white coloration may result from inclusions, surface frosting, or weathering.

Field identification & locations

Identify by its glassy luster, sharp angular faces, lack of obvious cleavage, and ability to scratch ordinary glass; a hardness or acid test should be performed cautiously. Common worldwide, especially in Brazil, Madagascar, Arkansas, and Alpine-type veins.