mineral

Iron-stained quartz or quartz-rich rock

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

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pinkish-tan to white, vitreous to dull luster, translucent edges, and irregular fracture. The dark brown area is consistent with iron-oxide staining or a small earthy inclusion; crystal faces are not clearly visible.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes in hydrothermal veins and cavities, then weathers free from host rock. Its exact age cannot be determined from the photograph; it is geologically plausible near 46.7°N, 92.0°W, where Precambrian crystalline rocks and glacially transported minerals occur.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate. Attractive pieces have modest collecting value but are generally not jewelry grade.

Geological facts

Pink coloration may result from iron oxides or microscopic inclusions rather than true rose quartz. A steel file should not scratch it, while quartz can scratch ordinary glass.

Field identification & locations

Likely identification requires a hardness test, streak test, and close inspection. Rose quartz, feldspar, and iron-stained chalcedony are alternatives; quartz leaves a white streak, whereas hematite leaves red-brown. Common in quartz veins, glacial tills, stream gravels, and mine dumps.