A pegmatite is an igneous rock, formed by slow crystallization at high temperature and pressure at depth, and exhibiting large interlocking crystals usually greater in size than 25 mm. Most pegmatites are intrusive rocks found in sheets of rock near large masses of igneous rocks called batholiths.

What is pegmatite texture?

A pegmatitic texture is one in which the mineral grains are exceptionally large. This texture is found in intrusive rocks. ... The extra large size does not mean that they cooled extra slowly. Instead, the large crystals of a pegmatite formed in a magma that was extra rich in dissolved water.

What Colour is pegmatite?

Pegmatite in which the main ingredients are biotite mica (black), microcline (pink), oligoclase (white), and quartz (gray). The rock has a monzogranitic composition.