metamorphic
Tumbled quartz-rich pebble, possibly jasper or quartzite
Microcrystalline quartz (SiO₂), likely quartzite or silicified rock
AI-generated identification · may be incorrectBrownish red to mauve, opaque, with a fine sugary texture and white quartz veining; vitreous to dull luster. Quartz hardness is about 7 Mohs, with no cleavage and conchoidal fracture; exact specific gravity is approximately 2.6.
Identified More metamorphic →
Explore Tumbled quartz-rich pebble, possibly jasper or quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Brownish red to mauve, opaque, with a fine sugary texture and white quartz veining; vitreous to dull luster. Quartz hardness is about 7 Mohs, with no cleavage and conchoidal fracture; exact specific gravity is approximately 2.6.
Formation & geological history
Likely formed from silica-rich sediment or volcanic material later compacted, metamorphosed, or silicified, then rounded by tumbling. Its precise geological age and source cannot be determined from the photograph.
Uses & applications
Suitable as a small lapidary, craft, or jewelry component; comparable material is used for beads, cabochons, decorative stone, and aggregate. Common specimens have modest commercial value.
Geological facts
The white zones may be quartz veins or uncolored quartz-rich patches, while the red-brown color commonly reflects iron oxides. The rounded shape and smooth surface indicate human tumbling rather than natural weathering alone.
Field identification & locations
Common in gravel deposits and silica-rich metamorphic terrains; identify with a steel file or glass scratch test, noting that quartz should scratch glass. Approximate value: $2–$15 for a small tumbled piece, more if cutting quality or provenance is exceptional.
More like this
