mineral

Raw quartz crystal, likely iron-stained quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Appears translucent honey-brown to pale orange with vitreous to resinous luster and irregular fractured faces; visible crystal form is poorly developed. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and hydrothermal deposits; the brown coloration commonly comes from iron-oxide inclusions or surface staining. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Used for glass, electronics, abrasives, and engineered stone; attractive transparent pieces may be cut or collected, though this example appears low-grade. Common rough specimens generally have modest value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is often mistaken for amber when iron-stained and translucent.

Field identification & locations

Test against glass: quartz should scratch it; it should not be scratched by a steel knife. Commonly found worldwide in quartz veins, pegmatites, and alluvial gravels; inspect for consistent hardness and conchoidal fracture.