igneous
Small rounded brown pebble, likely iron-stained quartz or quartzite
Quartz (SiO₂), possibly quartzite; identification is uncertain from the image
AI-generated identification · may be incorrectTan to brown, rounded and somewhat dull; likely Mohs hardness 7 if quartz-rich. Grain size and crystal structure are not discernible in the photograph; iron-oxide staining may cause the color.
Identified More igneous →
Explore Small rounded brown pebble, likely iron-stained quartz or quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Tan to brown, rounded and somewhat dull; likely Mohs hardness 7 if quartz-rich. Grain size and crystal structure are not discernible in the photograph; iron-oxide staining may cause the color.
Formation & geological history
Quartz grains may crystallize in igneous rocks or form quartzite when sandstone is metamorphosed; a pebble shape usually results from transport and abrasion. Its age and specific formation environment cannot be determined visually.
Uses & applications
Quartz-rich material is used in glass, ceramics, and construction aggregate; this specimen is chiefly suitable for casual collecting.
Geological facts
Brown coloration commonly comes from iron-oxide coatings or inclusions, rather than from quartz itself.
Field identification & locations
Check for a glassy, hard surface and lack of cleavage; quartz should scratch ordinary glass. Rounded shape suggests water or sediment transport, but a close-up or hardness test is needed to distinguish quartz from other pebbles.
