mineral

Milky quartz in weathered host rock

Quartz (SiO₂), likely a massive vein-quartz fragment

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, a vitreous to dull luster, and a trigonal crystal structure; it commonly breaks with irregular or conchoidal fractures and has no cleavage. The specimen appears pale gray-white with a rough tan, weathered exterior; the host material is not identifiable from the image.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms when silica-rich fluids fill fractures and crystallize, often in veins cutting older rocks. Its age and exact geological setting cannot be determined from appearance alone.

Uses & applications

Quartz is used in glass, electronics, abrasives, and construction; attractive pieces may be kept as inexpensive mineral specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and its hardness lets it scratch ordinary glass.

Field identification & locations

Look for glassy or waxy surfaces, lack of cleavage, and hardness near 7; quartz veins occur in many rock types worldwide. A scratch test on an inconspicuous spot can help distinguish it from softer lookalikes.