mineral

Raw quartz crystal/chunk

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Appears translucent gray-white with a vitreous to slightly frosted luster and irregular fracture; quartz is Mohs hardness 7, has no cleavage, hexagonal crystal structure, and specific gravity about 2.65.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous or metamorphic rocks over a wide geological range, commonly from Precambrian to recent formations.

Uses & applications

Used for glass, ceramics, abrasives, electronics, and engineered stone; attractive transparent pieces are collected, while gem-quality varieties are cut or polished.

Geological facts

The specimen’s rounded, broken form and internal cloudy layers are consistent with massive or vein quartz rather than a complete crystal. Surface alteration or coating may account for its frosted appearance.

Field identification & locations

Identify quartz by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; common sources include Brazil, Madagascar, the United States, and Alpine regions.