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poikilitic


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Applied to the texture produced when several orientated or unorientated crystals are enclosed within a larger crystal in an igneous rock. The larger crystals have more widely separated nuclei than the enclosed crystals, and may grow faster, thus enclosing surrounding grains. Where augite encloses a number of plagioclase feldspar crystals the poikilitic texture is given the specific name of ‘ophitic texture’.

Subjects: Earth Sciences and Geography.


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