metamorphic
Tumbled jasper or quartzite pebble
Jasper (microcrystalline quartz, SiO₂), possibly iron-stained quartzite
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque cream-yellow with pink-red hematite/iron-oxide veining, waxy to dull luster, and no visible cleavage. Fine-grained, compact texture; exact identification requires hardness and streak tests.
Identified More metamorphic →
Explore Tumbled jasper or quartzite pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness about 6.5–7 Mohs; opaque cream-yellow with pink-red hematite/iron-oxide veining, waxy to dull luster, and no visible cleavage. Fine-grained, compact texture; exact identification requires hardness and streak tests.
Formation & geological history
Likely formed from silica-rich sediment or volcanic material later silicified and/or metamorphosed, with iron-oxide staining along fractures. Such rocks range from Precambrian to much younger and occur in many continental environments.
Uses & applications
Used as a lapidary material for tumbled stones, cabochons, carvings, and decorative objects; common pieces have modest value.
Geological facts
The rounded shape and smooth surface indicate natural water abrasion or commercial tumbling. Red and yellow colors commonly result from hematite and goethite impurities.
Field identification & locations
Commonly found in stream gravels and jasper/quartzite deposits worldwide; it should scratch glass but not be scratched by a steel knife. A streak test, specific gravity, and close inspection for quartz grains would distinguish jasper from quartzite.
More like this
