Question

Magma can partially crystallize at depth and then rise to shallow depths where the remaining magma solidifies. The early-formed crystals are ____________ and the texture is ____________ .

Answer 1

Phenocrysts and Porphyritic texture

Explanation:

• The early formed crystals are of phenocrysts and the texture of these crystals is porphyritic texture.  
• This crystallization occurs when early-forming plagioclase crystals which are rich in calcium start coating with plagioclase crystals which are rich in sodium.
• On cooling, the magma is then processed in a volcanic eruption, after the eruption the liquid which is left behind will start cooling and forms a porphyritic texture.