mineral

Possibly iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), identification uncertain from the image

AI-generated identification · may be incorrect

Small, rough specimen with a gray-blue exterior and rusty brown interior or coating; likely vitreous to dull luster. Quartz has Mohs hardness 7 and a hexagonal crystal structure; no clear cleavage. The visible surface is insufficient to confirm composition or specific gravity.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Quartz may form in hydrothermal veins or cavities and can be stained by iron oxides during weathering; its age and exact formation environment cannot be determined from the image.

Uses & applications

Quartz is widely used in glass, electronics, and ornamental objects; attractive pieces may be cut or collected.

Geological facts

Brown coloration can result from iron-oxide staining, but the image alone cannot distinguish that from other minerals or a mixed rock.

Field identification & locations

Check for hardness, streak, translucency, and crystal or fracture surfaces; common quartz occurs worldwide. Avoid scratching valuable specimens during testing.