mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, yellowish-tan to off-white, waxy to vitreous luster, microcrystalline to cryptocrystalline aggregate structure, no cleavage, smooth water-worn texture, translucent to opaque.
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Physical properties
Hardness 7 on Mohs scale, yellowish-tan to off-white, waxy to vitreous luster, microcrystalline to cryptocrystalline aggregate structure, no cleavage, smooth water-worn texture, translucent to opaque.
Formation & geological history
Formed via river or beach erosion rounding pre-existing vein quartz or quartzite fragments. The yellowish discoloration is often due to iron oxide staining within micro-fractures.
Uses & applications
Used primarily in decorative landscaping, pebble art, aquariums, tumbling, and as a common rock collector specimen.
Geological facts
Quartz is one of the most resistant minerals on Earth's surface, allowing small pebbles like this to survive thousands of years of tumbling in streams and rivers without dissolving.
Field identification & locations
Identify by its hardness (scratches glass readily), smooth river-worn oval shape, lack of cleavage, and translucent yellowish appearance. Very common in gravel beds, stream deposits, and coastal beaches globally.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous