mineral

Quartz-rich rock fragment, possibly chalcedony or weathered quartz

Silicon dioxide (SiO₂), likely quartz/chalcedony

AI-generated identification · may be incorrect

Yellow to tan, translucent edges, vitreous to waxy luster, and irregular fracture; quartz has Mohs hardness 7 and no cleavage. The image is insufficient to determine crystal structure or specific gravity confidently.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by silica-rich hydrothermal or groundwater deposition in a cavity or vein; its yellow coloration may result from iron-oxide staining. Precise geological age and locality cannot be determined visually.

Uses & applications

Common quartz and chalcedony are used for abrasives, glass, electronics, carvings, and inexpensive cabochons; this small rough fragment has mainly educational or collector interest.

Geological facts

Iron staining commonly produces yellow, orange, or brown quartz surfaces. A glassy fracture and inability to scratch it with a steel blade support quartz identification.

Field identification & locations

Look for hardness, translucent edges, conchoidal fracture, and lack of cleavage; test against glass and inspect with a 10× loupe. Common worldwide in veins, geodes, and alluvial gravels.