mineral

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, vitreous luster, and no true cleavage; fracture is uneven to conchoidal. The specimen appears as a small irregular, partly translucent fragment, though the image is not sufficient for precise identification.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and metamorphic veins; individual crystals may range from ancient Precambrian to recent geological ages. It commonly occurs in granite, pegmatite, quartz veins, and sedimentary rocks.

Uses & applications

Used in glass, ceramics, abrasives, electronics, and engineered stone; attractive crystals are collected and occasionally used as gemstones. This small fragment has minimal commercial value.

Geological facts

Milky whiteness usually results from microscopic fluid inclusions or fractures scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and Alpine regions. Confirm with a scratch test against glass, checking that it scratches glass but is not scratched by a steel knife; avoid damaging potentially valuable pieces.