mineral

Likely iron-stained quartz or quartzite fragment

Quartz (SiO₂), possibly ferruginous quartzite; identification is uncertain from the image

AI-generated identification · may be incorrect

Brown to rusty reddish-brown, rough and opaque to slightly translucent, with a dull/glassy luster; quartz hardness is 7 Mohs and has no cleavage. Crystal structure is trigonal; iron-oxide staining likely produces the color.

Identified October 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in many igneous, metamorphic, and hydrothermal settings; quartzite forms when quartz-rich sandstone is metamorphosed. No age or specific formation can be determined from the image.

Uses & applications

Common quartz is used in glass, abrasives, and electronics; attractive specimens may be collected or used decoratively, though this piece shows no obvious gem quality.

Geological facts

Rust-colored coatings commonly result from iron oxides such as hematite or goethite.

Field identification & locations

The specimen appears elongated and irregular, with a rusty surface; test hardness on an inconspicuous spot and inspect a fresh break for glassy quartz grains. Quartz is widespread worldwide; the photo alone cannot confirm the exact identification.