igneous
Weathered quartz-bearing rock, possibly iron-stained quartzite or granitic pegmatite
Indeterminate; likely quartz-rich silicate rock with iron-oxide staining (SiO₂-dominant)
AI-generated identification · may be incorrectHardness approximately 6–7 Mohs; pale gray, cream, and rusty brown, with a rough granular texture, vitreous-to-earthy luster, and no obvious cleavage. The metallic-looking areas may be iron oxides rather than native metal.
Identified More igneous →
Explore Weathered quartz-bearing rock, possibly iron-stained quartzite or granitic pegmatite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness approximately 6–7 Mohs; pale gray, cream, and rusty brown, with a rough granular texture, vitreous-to-earthy luster, and no obvious cleavage. The metallic-looking areas may be iron oxides rather than native metal.
Formation & geological history
Likely formed from silica-rich igneous or metamorphic material, then fractured and weathered, producing limonite/goethite staining. Its geological age cannot be determined from the photograph.
Uses & applications
Quartz-rich rock may be used as aggregate, decorative stone, or lapidary material, but this rough specimen has limited commercial use. Collector value is mainly aesthetic or locality-based.
Geological facts
The irregular rusty coloration commonly results from oxidation of iron-bearing minerals. A streak, hardness, acid, and magnetism test would substantially improve identification.
Field identification & locations
Common in quartz veins, granitic terrains, and weathered metamorphic outcrops worldwide; it should scratch glass if quartz-rich. Estimated value: $1–$15 for an ordinary hand specimen, potentially more if a documented locality or unusual mineralization is confirmed.
