metamorphic
Weathered, iron-stained quartz-rich rock (likely quartzite)
Quartzite, composed mainly of quartz (SiO₂); identification is provisional from the photograph
AI-generated identification · may be incorrectCream to tan, rusty-brown staining, rough and granular with pale bands and cavities; quartz has Mohs hardness 7 and vitreous luster, while quartzite typically lacks cleavage and has interlocking grains. The specimen’s weathering and texture make precise identification uncertain.
Identified More metamorphic →
Explore Weathered, iron-stained quartz-rich rock (likely quartzite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Cream to tan, rusty-brown staining, rough and granular with pale bands and cavities; quartz has Mohs hardness 7 and vitreous luster, while quartzite typically lacks cleavage and has interlocking grains. The specimen’s weathering and texture make precise identification uncertain.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism. Its age cannot be determined from appearance alone; iron oxides likely produced the rusty coloration during weathering.
Uses & applications
Quartzite is used as crushed stone, building and decorative stone, and sometimes as a silica source; this weathered piece is most suitable for collecting or display.
Geological facts
Quartzite is generally harder and more resistant to erosion than its sandstone precursor, though porous weathered surfaces can develop pits and cavities.
Field identification & locations
Look for tightly fused quartz grains and a scratch-resistant surface; quartzite often breaks across grains rather than around them. It occurs in metamorphic belts worldwide; a hardness or thin-section test would help confirm the identification.
More like this
