metamorphic
Rounded pebble, likely quartzite
Quartzite (dominantly recrystallized quartz, SiO₂); identification is uncertain from the image alone
AI-generated identification · may be incorrectRounded, pale gray-tan pebble with a rusty reddish patch and a dull to slightly granular surface. Quartzite is typically Mohs 7, non-cleaving, and has a tightly interlocking quartz crystal texture; specific gravity is about 2.6–2.7.
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Physical properties
Rounded, pale gray-tan pebble with a rusty reddish patch and a dull to slightly granular surface. Quartzite is typically Mohs 7, non-cleaving, and has a tightly interlocking quartz crystal texture; specific gravity is about 2.6–2.7.
Formation & geological history
Quartz-rich sandstone transformed by heat and pressure during metamorphism, at varied geological ages. The pebble’s rounded shape suggests transport and abrasion in a stream or shoreline setting.
Uses & applications
Quartzite is used as dimension stone, aggregate, and in some cases decorative or landscaping stone; this small pebble has mainly educational or collecting value.
Geological facts
Iron-oxide staining can create rusty red or brown patches on otherwise pale quartz-rich rocks.
Field identification & locations
Look for a hard, quartz-rich pebble that resists scratching by a steel blade and lacks visible layering; quartzite is common in river gravels and beaches worldwide. A photo cannot confirm the rock type.
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