mineral

Milky quartz (possibly smoky/iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Translucent white-gray, vitreous luster, massive to weakly crystalline texture; Mohs hardness 7, no cleavage, conchoidal fracture, specific gravity about 2.65. Brown coloration may be iron-oxide staining or slight smoky quartz.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in fractures and cavities, commonly in hydrothermal veins and pegmatites. Quartz is geologically widespread and can range from Precambrian to recent; this appearance is plausible in the Piedmont near 35.7°N, 80.3°W.

Uses & applications

Used for glass, ceramics, abrasives, electronics, and engineered stone; attractive transparent pieces are collectible, though this specimen is probably modest commercial quality.

Geological facts

Quartz commonly shows six-sided crystal faces, but massive milky quartz may lack obvious crystals. It scratches ordinary glass and is not scratched by a steel knife.

Field identification & locations

Common in North Carolina Piedmont veins and stream gravels, often associated with feldspar, mica, and iron staining. Confirm with a glass-scratch test and inspect for hexagonal faces; calcite is softer and reacts with dilute acid.