mineral

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), likely with iron-oxide staining and minor host minerals

AI-generated identification · may be incorrect

White to gray, dull-to-waxy luster, massive rather than visibly crystalline, with yellow-brown iron staining and rough weathered surfaces. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen’s softness and texture are difficult to confirm visually.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as a quartz vein or quartz-rich metamorphic fragment, later exposed and chemically weathered; its precise geological age and locality cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, foundry materials, and electronics; attractive pieces may be collected but are generally low-value.

Geological facts

Iron oxides commonly produce yellow, orange, or brown patches on otherwise white quartz. The rounded form suggests transport or prolonged surface weathering.

Field identification & locations

Test with a steel file or knife: true quartz should resist scratching; inspect for glassy fracture and translucent edges. Common worldwide, especially in quartz veins, stream gravels, and quartzite terrains.