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Rock Formations - Coggle Diagram

- - - - cools inside the Earth
      - generally larger crystals than the volcanic rocks
      - e.g. granite
        
        also includes quartz and feldspar, different components
        
        medium to course crystals
        
        hardness: 5~5.5
      - e.g. basalt
    - - suffers a quick cooldown on the surface of Earth
      - usually has small crystals
      - e.g. obsidian
        
        glasslike
        
        made of feldspar, quartz, etc
        
        hardness: 6~7
      - e.g. basalt
        
        made of plagioclase, feldspar, etc
        
        dark and dense
        
        fine grained
        
        hardness: 5~6
      - e.g. Scoria
        
        made of feldspar, augite, etc
        
        basically basalt with cavities filled with other minerals
      - e.g. Rhyolite
        
        made of feldspar, quartz, etc
        
        fine, usually porous texture
        
        floats in water
- - - - formed from preexisting rocks
      - arranged by size of particle, small to large
        
        clay, silt, sand, gravel, pebble and boulder
      - e.g. shale, sandstone, conglomerate
    - - formed by precipitation of minerals in water
    - - e.g. coal or limestone
      - accumulation of debris of organisms