mineral

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely massive/milky quartz with hematite/goethite staining

AI-generated identification · may be incorrect

White to translucent gray, glassy to pearly luster, irregular fracture with some conchoidal surfaces; Mohs hardness 7, no cleavage, specific gravity about 2.65. Brown-red patches are likely iron oxides, while the darker edge may be host rock or weathering.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids fill fractures or cavities, or as veins in surrounding rock; commonly associated with Precambrian crystalline terranes. The specimen’s exact age cannot be determined from the photograph.

Uses & applications

Quartz is used in glass, ceramics, electronics, abrasives, and construction aggregate; attractive pieces are collected or used ornamentally, though this example has limited gem value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. It may be confused with white feldspar, but quartz is harder and lacks feldspar’s cleavage.

Field identification & locations

Likely plausible near 9.5°N, 45.6°E, where weathered crystalline rocks and quartz veins can occur. Test cautiously: quartz should scratch ordinary glass and should not be scratched by a steel knife; avoid destructive testing on valuable specimens.