mineral

Quartz crystal point (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Likely Mohs hardness 7, vitreous luster, hexagonal crystal structure, and no true cleavage; the brown-gold coloration may be smoky quartz, iron-oxide staining, or surface coating. The specimen appears faceted or naturally terminated, but image detail is insufficient for confident identification.

Identified August 11, 2026More mineral →

Explore Quartz crystal point (likely smoky or iron-stained quartz) in the encyclopedia →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids or igneous cavities, commonly during late-stage cooling of granite and pegmatite; individual crystals may range from ancient Precambrian to recent formation. Common localities include Brazil, Madagascar, the United States, and the Alps.

Uses & applications

Used in glass, electronics, abrasives, and optical instruments; clear or attractive crystals are collected and sometimes cut as gemstones.

Geological facts

Quartz is piezoelectric, producing an electrical charge under pressure. A scratch test against ordinary steel or glass can help confirm hardness, though it may damage the specimen.

Field identification & locations

Look for a glassy luster, hexagonal prismatic form, conchoidal fracture, and lack of cleavage; check that color is internal rather than paint or metallic foil. Similar-looking glass is usually bubble-rich and lacks crystal faces.