mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent with a glassy-to-dull luster and irregular fracture; hardness 7 on the Mohs scale, no cleavage, and trigonal crystal structure. The rough, blocky appearance is consistent with massive quartz, though the photo alone cannot rule out another pale mineral such as calcite.

Identified September 30, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in many settings, including cooling silica-rich melts and mineral-bearing hydrothermal veins; it is common in rocks of many geological ages. This specimen’s specific source and age cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, ceramics, electronics, and construction aggregate; attractive pieces are collected or used decoratively.

Geological facts

Quartz is one of Earth’s most abundant minerals and often occurs as veins cutting through surrounding rock.

Field identification & locations

Look for hardness—quartz can scratch glass—and lack of obvious cleavage; calcite is softer and commonly fizzes with dilute acid. Common worldwide, including in veins and granites; value is likely about $1–$10 for a small, ordinary rough specimen.