metamorphic

Weathered iron-rich rock with quartz/calcite veining

Likely ironstone or ferruginous quartzite; white material may be quartz or calcite

AI-generated identification · may be incorrect

Dark reddish-brown, dense, fine- to medium-grained, and weakly lustrous with rusty iron-oxide staining. Likely hardness 5–7 overall; white vein material is glassy quartz (Mohs 7) or softer calcite (Mohs 3), with no obvious crystal structure visible.

Identified September 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed from iron-rich sediment or altered silicate rock, followed by oxidation during weathering; the white veins formed when silica- or carbonate-rich fluids filled fractures. Exact geological age and locality cannot be determined from the image.

Uses & applications

Used locally as decorative stone, aggregate, or an iron-ore indicator; generally little jewelry value unless cut and polished attractively.

Geological facts

The brown-red coloration is commonly produced by hematite, goethite, or limonite. A streak, hardness, and acid test would distinguish quartz from calcite and clarify the identification.

Field identification & locations

Look for unusually high density, rusty red-brown streak, and resistance to scratching; quartz veins resist a knife, while calcite fizzes in dilute hydrochloric acid. Common in weathered iron-formations and hydrothermal zones worldwide.