mineral

Quartz-rich rock, likely milky quartz

Quartz (SiO₂), possibly massive vein quartz

AI-generated identification · may be incorrect

Opaque white to pale gray with a vitreous-to-dull luster and irregular fracture; quartz hardness is 7 on the Mohs scale and its crystals have a trigonal structure. The photo does not show diagnostic features clearly enough to determine whether this is pure quartz or a quartz-rich rock.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms when silica-rich fluids fill fractures and crystallize as veins, or as grains in igneous and metamorphic rocks. Quartz occurs in rocks of many geological ages; the specimen’s age and exact formation cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative stone; attractive pieces may be collected or fashioned into ornaments.

Geological facts

Quartz is one of Earth’s most abundant minerals and has no cleavage, typically breaking with a curved or irregular fracture.

Field identification & locations

The pale color and massive appearance are consistent with milky quartz, but a scratch test on glass (quartz should scratch it) and examination for distinct grains or layering can help distinguish it from other rocks. Quartz occurs worldwide, especially in veins and pegmatites.