IGNEOUS ROCKS

The main types of igneaous rocks

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SILICIC - GRANITE

CRYSTAL GRAIN SIZE: Coarse

TEXTURE: Porphyritic

COLOUR: Dark Grey to Pink

SILICA PERCENTAGE: >66%

ENVIRONMENT OF FORMATION: Plutonic

MINERAL COMPOSITION: Orthoclase Feldspar, some biotite and Muscovite Mica and Hornblende

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