A type of crystalline rock formation composed primarily of granite and feldspar, found in mountainous regions.
From German 'Berg' (mountain) and Greek 'lithos' (stone), combining elements meaning 'mountain stone' to describe rocks formed in alpine environments.
Geologists use this term to classify rocks by their origin environment rather than just their mineral content—it's like saying 'this rock has a mountain address' rather than just listing its ingredients! This reflects how geology evolved from simple naming to understanding Earth's geological neighborhoods.
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