Igneous or Metamorphic
Granite or Granitic Gneiss Pebble
Granite (felsic intrusive igneous rock) or Gneiss
Hard, 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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Milky Quartz Pebble
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