metamorphic

Iron-stained quartzite or quartz-rich breccia

Quartz (SiO₂), likely with iron oxides/hydroxides such as hematite and limonite

AI-generated identification · may be incorrect

Hardness about 7 for quartz; pale pink, cream, and rusty brown coloration; vitreous to dull luster; granular, massive texture with no obvious cleavage. The rusty patches indicate iron-oxide staining, while the angular pale fragments may represent recrystallized or brecciated quartz.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed from quartz-rich sandstone metamorphosed into quartzite, with later weathering and iron staining. A precise age cannot be determined visually; quartzite and iron-stained float are plausible in the Pacific Northwest, including around the Columbia River region.

Uses & applications

Primarily a common collecting specimen or landscaping stone; quartzite is used as aggregate, road material, building stone, and occasionally decorative stone. This piece does not appear gem-grade.

Geological facts

Quartzite commonly breaks across grains rather than around them and is usually harder than ordinary sandstone. Iron staining can produce attractive red, orange, and yellow patterns without indicating valuable metal content.

Field identification & locations

Look for a very hard surface that scratches glass, quartz grains fused into a solid mass, and rusty coatings or veins. Common regional alternatives include weathered quartz-rich river cobbles and iron-stained sandstone; acid testing is generally unhelpful. Estimated value: $1–$10 as an ordinary specimen, or up to about $20 if unusually patterned or polished.