The very large crystals of quartz, feldspar, and muscovite found in pegmatites form from the final crystallizing parts of a magma.
In comparison to the ions in the melt, the ions in water are far more mobile. They may move about freely and crystallize quickly as a result. This explains why pegmatite crystals enlarge so much. Extreme crystallization conditions can sometimes result in crystals that are several meters long and weigh more than a ton.
Instead, a magma that was particularly rich in dissolved water led to the formation of a pegmatite's enormous crystals. The water made it possible for the required components to diffuse to the crystallization sites very quickly. Veins that appeared at the conclusion of the crystallization of a sizable intrusive mass frequently develop pegmatites.
To know about crystallizing parts visit :
https://brainly.com/question/1212769
#SPJ4
