mineral

Quartz with dark inclusions

Quartz, silicon dioxide (SiO₂), likely included or milky quartz

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous to pearly luster, white/translucent body, and irregular to conchoidal fracture; quartz is trigonal and lacks cleavage. The dark patches may be biotite, amphibole, tourmaline, iron/manganese oxides, or attached host rock.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous fluids, hydrothermal veins, pegmatites, and metamorphic rocks; inclusions formed during or after crystal growth. The specimen’s exact age and locality cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive included varieties are collected and occasionally used in cabochons or decorative objects.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities. A steel file should not scratch fresh quartz, while quartz can scratch ordinary glass.

Field identification & locations

Look for glassy luster, hardness near 7, no consistent cleavage, and conchoidal fracture; inspect dark areas with a loupe to distinguish inclusions from matrix. Quartz occurs worldwide, especially in veins, pegmatites, and granitic terrains.