Rock Stability

Asst. Prof. Dr. Ayşe pekrioğlu Balkıs
Texture of Rocks
SMALL CRYSTALS --------- COOLED QUICKLY
(because of the reduced time for atoms to attain minimum energy configuration)
BIG CRYSTALS ------------- COOLED SLOWLY
Cooling may be so rapid, as in a volcanic eruption, that no crystalline structure develops before solidification:
and an amorphous material such as obsidian (volcanic glass) is formed.