metamorphic

Iron-stained quartz-rich rock

Likely ferruginous quartzite; chiefly quartz (SiO₂) with iron oxides/hydroxides

AI-generated identification · may be incorrect

Tan, rusty orange, and white with a granular, slightly sparkly surface; quartz has Mohs hardness 7 and a vitreous luster, while iron staining is earthy. The small, rough specimen does not show diagnostic crystal faces or cleavage.

Identified September 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz-rich sediment may have been cemented or metamorphosed into quartzite, with later iron-bearing fluids staining it orange-brown. Its age and exact formation setting cannot be determined from the image.

Uses & applications

Quartzite is used as crushed stone, aggregate, and decorative building stone; this small rough piece is mainly suitable for collecting or display.

Geological facts

Rust-colored coatings commonly consist of iron oxides such as hematite or goethite and can color otherwise pale quartz-rich rocks.

Field identification & locations

Look for hard, interlocking quartz grains and a rusty coating; quartz will scratch glass. Quartzite and iron-stained quartz-rich rocks occur worldwide, but confirming the rock type requires close examination.