metamorphic
Schist or Gneiss pebble
Metamorphic rock (Schist/Gneiss)
AI-generated identification · may be incorrectDark colored with lighter bands or veins, foliated texture, hardness depends on mineral composition (typically 5-7), dull to somewhat shiny luster especially when wet.
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Physical properties
Dark colored with lighter bands or veins, foliated texture, hardness depends on mineral composition (typically 5-7), dull to somewhat shiny luster especially when wet.
Formation & geological history
Formed from regional metamorphism of pre-existing rocks (like shale or igneous rocks) under high heat and pressure, then weathered and water-tumbled into a pebble.
Uses & applications
Commonly collected as river rocks or beach pebbles; larger pieces used in landscaping.
Geological facts
The foliation (banding) is caused by the alignment of minerals under extreme pressure deep within the Earth's crust.
Field identification & locations
Identified by its foliated/banded appearance and typically dark color with light streaks. Found in riverbeds, beaches, and glacial deposits.
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