Igneous or Metamorphic
Granite or Granitic Gneiss Pebble
Granite (felsic intrusive igneous rock) or Gneiss
AI-generated identification · may be incorrectHard, granular texture, consisting of quartz (grey/clear), feldspar (white/pinkish), and mica or hornblende (black flakes).
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Physical properties
Hard, granular texture, consisting of quartz (grey/clear), feldspar (white/pinkish), and mica or hornblende (black flakes).
Formation & geological history
Formed from slow cooling of magma deep underground (granite) or by high grade regional metamorphism (gneiss). Rounded by water action.
Uses & applications
Commonly used in construction, landscaping, and aggregate.
Geological facts
Rocks rounded like this are typically found in riverbeds, beaches, or glacial till.
Field identification & locations
Identified by its visible interlocking crystals. Look for the 'salt and pepper' appearance.
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Other igneous or metamorphic specimens
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Biotite Mica Schist
Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2
metamorphic
Eclipse Stone (Kabamba Jasper)
Rhyolite with Aegirine (NaFe3+Si2O6)
metamorphic
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Feldspar (Plagioclase / Potassium Feldspar)
Feldspar Group (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
mineral