mineral

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous luster, white to translucent color, and a hexagonal crystal structure; it has indistinct cleavage and conchoidal fracture. The dark area may be attached matrix, iron staining, or another mineral inclusion.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids or igneous melts, commonly in veins and cavities; the specimen appears naturally broken or partly weathered. Its precise geological age and locality cannot be determined from the image.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and countertops; clear or well-formed crystals are collected and sometimes used in jewelry. This small fragment has limited commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Translucent white quartz is commonly called milky quartz.

Field identification & locations

Identify it by its glassy appearance, hardness sufficient to scratch ordinary glass, and lack of obvious cleavage; avoid confusing it with man-made glass. Common worldwide in granitic rocks, pegmatites, and hydrothermal veins.