metamorphic
Iron-stained quartzite cobble
Quartzite, predominantly quartz (SiO₂), colored by iron-oxide coatings or inclusions
AI-generated identification · may be incorrectRounded, massive, yellow-orange and cream with a dull to slightly vitreous surface and irregular pits. Quartz hardness is about 7 Mohs; quartzite has no cleavage and a granular crystalline texture. Exact identification is uncertain from the photo alone.
Identified More metamorphic →
Explore Iron-stained quartzite cobble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Rounded, massive, yellow-orange and cream with a dull to slightly vitreous surface and irregular pits. Quartz hardness is about 7 Mohs; quartzite has no cleavage and a granular crystalline texture. Exact identification is uncertain from the photo alone.
Formation & geological history
Quartz-rich sandstone recrystallized under heat and pressure; iron oxides impart the orange color. Quartzites form in many geologic eras, so age and source cannot be determined from appearance alone.
Uses & applications
Commonly used as landscaping stone, aggregate, and decorative material; attractive cobbles are collected or used in garden displays.
Geological facts
The vivid coloration commonly comes from iron oxides such as goethite or hematite rather than from orange quartz itself.
Field identification & locations
Look for a very hard, quartz-rich surface that scratches glass and lacks the layered texture of sandstone. Rounded shape suggests transport by water or glacial action; locality cannot be inferred from the image.
More like this
