Saddleback
GEOL 3 -
Igneous Rocks
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CGignrxIGNEOUS ROCKSROCK CYCLEIgneous Rocks (Largest Rock Group)Rock CycleI. Form from molten Material called MagmaMagma on or near surface is called LavaII. Two Categories1. Intrusive or Plutonica. form deep in Lithosphereb. cools slowly which forms large crystals2. Extrusive or Volcanica. form or crystallize at or near surfaceb. cool fast--small crystalsIII. Classification of Igneous RocksA. Mineral CompositionB. Texture-relationship between grains (crystals)1. Coarse crystals-crystals that you can see with naked eye (Phaneritic)2. Fine crystals (microscopic) crystals that cannot be seen with naked eye(Aphanitic)3. Porphyry-both large and small crystalsLarge crystals called PhenocrystsCGignrxFine grained Matrix or ground
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