A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are …

Pegmatites are extreme igneous rocks that form during the final stage of a magma’s crystallization. They are extreme because they contain exceptionally large crystals and they sometimes contain minerals …

Sep 1, 2012 · Pegmatite is a very coarse-grained igneous rock with giant crystals. Discover how it forms, what minerals it contains, and where they occur.

Pegmatite is a coarse-grained igneous rock, renowned for its exceptionally large crystals, Composed mainly of quartz, feldspar, and mica, it shares a similar composition to granite but differs significantly …

pegmatite, almost any wholly crystalline igneous rock that is at least in part very coarse grained, the major constituents of which include minerals typically found in ordinary igneous rocks and in which …

Pegmatite is an intrusive igneous rock, forming below the Earth’s surface where magma slowly cools. Its exceptionally coarse-grained texture features individual mineral crystals that are visibly large.

There are two main types of pegmatites: simple pegmatites, which have a relatively uniform mineral composition, and rare-mineral pegmatites, which contain a more diverse array of exotic minerals. …