metamorphic
Tumbled quartz-rich pebble, possibly quartzite
Quartzite (mostly SiO₂), or quartz-bearing chert; exact identification requires testing
AI-generated identification · may be incorrectPale cream to tan, opaque-to-translucent, smooth water-worn surface, vitreous to dull luster, and no visible cleavage. Quartz has Mohs hardness 7; quartzite is typically dense, tough, and has specific gravity around 2.6–2.7.
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Physical properties
Pale cream to tan, opaque-to-translucent, smooth water-worn surface, vitreous to dull luster, and no visible cleavage. Quartz has Mohs hardness 7; quartzite is typically dense, tough, and has specific gravity around 2.6–2.7.
Formation & geological history
Likely a naturally rounded river or beach pebble, possibly derived from metamorphosed sandstone; quartzite commonly formed during regional metamorphism millions to billions of years ago. The image alone cannot establish age or exact formation.
Uses & applications
Used as decorative stone, landscaping aggregate, abrasive material, and occasionally in jewelry or polished specimens. Its value is generally modest unless unusually colored, patterned, or locality-documented.
Geological facts
The specimen’s smooth shape indicates transport or tumbling rather than crystal growth. A steel knife should not scratch it, while quartz or a glass plate may scratch it.
Field identification & locations
Common in river gravels, beaches, glacial deposits, and quartzite-bearing terrains worldwide. Look for granular quartz texture, strong hardness, and lack of fizz with dilute hydrochloric acid; a streak and scratch test can distinguish it from softer limestone.
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