metamorphic
Likely quartz-rich metamorphic pebble
Possibly quartzite; exact identification is uncertain from the photo
AI-generated identification · may be incorrectRounded, mottled pink, white, and gray pebble with a granular, nonmetallic surface. If quartzite, it is mainly interlocking quartz (Mohs 7), with possible feldspar or other accessory minerals; crystal structure is trigonal.
Identified More metamorphic →
Explore Likely quartz-rich metamorphic pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Rounded, mottled pink, white, and gray pebble with a granular, nonmetallic surface. If quartzite, it is mainly interlocking quartz (Mohs 7), with possible feldspar or other accessory minerals; crystal structure is trigonal.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism. Its age and original source cannot be determined from appearance alone.
Uses & applications
Small specimens are mainly used for collecting or decoration; quartzite is also used as aggregate, paving, and building stone.
Geological facts
Quartzite is typically very hard and often breaks through its quartz grains rather than around them.
Field identification & locations
Look for a hard, gritty-looking texture and test whether it scratches glass; a field test or closer view is needed to distinguish quartzite from other mixed-grain rocks. Quartzite occurs worldwide in metamorphic terrains.
More like this
