mineral

Quartz-rich rock, possibly milky quartz with iron staining

Quartz (SiO₂), likely massive milky quartz with limonite/goethite inclusions

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with rusty brown iron staining; quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rounded shape appears naturally water-worn or tumbled.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids or forms in veins and cavities; iron-bearing groundwater can produce brown limonite/goethite staining. Its precise geological age cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected or used as lapidary material, though this specimen appears ordinary rather than gem-grade.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant, allowing quartz pebbles to survive weathering and transport. The brown areas are likely iron oxides rather than a separate metallic mineral.

Field identification & locations

Identify it by its hardness—scratches glass or ordinary steel—lack of cleavage, and conchoidal fracture; a streak test should be white. Common in quartz veins, stream gravels, and hydrothermal terrains worldwide.