pegmatitic definition
A pegmatite is a holocrystalline, intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic. The word pegmatite derives from Homeric Greek, ÏÎ®Î³Î½ÏÎ¼Î¹, which means âto bind togetherâ, in reference to the intertwined crystals of quartz and feldspar in the texture known as graphic granite. Most pegmatites are composed of quartz, feldspar and mica, having a similar silicic composition as granite ...