mineral
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
AI-generated identification · may be incorrectMohs hardness about 7 if quartz-rich; pale blue-gray, opaque to translucent, with a dull to weakly vitreous luster and no obvious cleavage. The rounded, irregular form indicates natural abrasion or tumbling.
Identified More mineral →
Explore Pale blue-gray quartz-rich pebble (tentative) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness about 7 if quartz-rich; pale blue-gray, opaque to translucent, with a dull to weakly vitreous luster and no obvious cleavage. The rounded, irregular form indicates natural abrasion or tumbling.
Formation & geological history
Likely weathered from a quartz vein, metamorphic rock, or silicified volcanic material and transported by water; its geological age cannot be determined from the photograph.
Uses & applications
Primarily a curiosity or lapidary specimen; quartz-rich material may be polished, tumbled, or used decoratively, but this piece has little commercial value.
Geological facts
The blue-gray color may result from microscopic inclusions, alteration, or surface coating; color alone cannot reliably identify the mineral.
Field identification & locations
Commonly found in stream gravels and weathered rock deposits. Test cautiously with a steel file or glass—quartz should scratch glass, though coatings or softer inclusions can mislead; acid testing is generally unhelpful.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
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
Septarian Pebble
Septarian nodule / Concretion
sedimentary