metamorphic

Iron-stained quartz-rich rock (possibly iron-stained quartzite)

Quartz-rich silicate rock; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Tan to rusty orange, opaque, with a rough granular texture and pale quartz-like patches. Quartz has Mohs hardness 7, vitreous luster, and no cleavage; the specimen’s grain size and specific gravity cannot be determined visually.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely quartz-rich material colored by iron oxides during weathering; if quartzite, it formed by metamorphism of sandstone. Its age and precise formation setting cannot be established from the photograph.

Uses & applications

Quartzite may be used as construction aggregate, building stone, or landscaping material; small iron-stained fragments are mainly collected for their appearance.

Geological facts

Rusty coloration commonly comes from hematite or goethite coating or cementing mineral grains.

Field identification & locations

Look for hard, interlocking quartz grains and test whether it scratches glass; a streak or hardness test can help distinguish quartz-rich rock from softer iron-rich material. Quartz-rich rocks occur worldwide.