Here's why:
* Aphanatic refers to an igneous rock texture where the mineral grains are too small to be seen with the naked eye. This indicates rapid cooling of the magma.
* Mineral grain growth is a fundamental process in the crystallization of magma. As magma cools, atoms and molecules within the melt start to arrange themselves into crystalline structures.
* Rapid cooling doesn't prevent crystal growth, it just limits the size of the crystals.
In summary:
* Aphanatic magma still undergoes crystallization.
* The rapid cooling simply prevents the crystals from growing large enough to be visible without a microscope.
Let me know if you have any more questions!
