Igneous Rocks

Key info for igneous rocks

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Igneous Rocks

Crystaline (1 mark)

Size and formation

Coarse 5mm+ are formed deep in planet

Medium 1-5mm Sill/Dyke (intrusions)

Fine<1mm Lava Flows

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Shape

Euhedral

Subhedral

Anhedral

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Orientation

Glassy-Super cooling (volcanic glass).(lava pours into water)

ALWAYS- CRYSATLINE

Equigranular or Porphytic

Vesicles(formed by gas bubbles escaping)

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