mineral

Raw quartz crystal

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

AI-generated identification · may be incorrect

Hardness 7 Mohs; colorless to translucent white with internal fractures and brown surface matrix; vitreous luster and hexagonal crystal structure. Quartz has no true cleavage, typically showing conchoidal fracture; specific gravity is about 2.65.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or magma cool in cavities and fractures, commonly producing prismatic crystals. The specimen’s exact geological age cannot be determined from the photograph.

Uses & applications

Used for glass, electronics, abrasives, optical components, and decorative specimens; clear crystals may have modest jewelry or collector value.

Geological facts

The prismatic form and flat, angled termination are characteristic of quartz, though the crystal appears damaged or naturally incomplete. Internal veils and fractures are common in natural quartz.

Field identification & locations

Identify by its glassy luster, hexagonal prism habit, lack of cleavage, and ability to scratch ordinary glass; avoid confusing it with man-made glass, which often has bubbles and irregular surfaces. Common localities include Brazil, Madagascar, the United States, and worldwide hydrothermal veins.