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...

the eastern edge by the Blue Ridge Front. The pegmatites intruded into the Ashe Formation. The pegmatites and country rock are part of the Spruce Pine...

The Harding Pegmatite Mine is a former adit mine that extracted lithium, tantalum, and beryllium from a Precambrian pegmatite sill. It ceased operations...

The Tin Mountain pegmatite is an igneous intrusion located in the southern Black Hills, South Dakota. It is a part of the Harney Peak Granite dome that...

granites, pegmatites, and schists, and "books" (large individual crystals) of mica several feet across have been found in some pegmatites. Micas are...

exhibits—all designed to inspire visitors about Maine's geologic history, pegmatite mining, and our planet's place in the solar system. The museum was formed...

Lepidolite is found with other lithium-bearing minerals, such as spodumene, in pegmatite bodies. It has also been found in high-temperature quartz veins, greisens...

visited the point and gave the name because of the abundance of the rock Pegmatite. 84°56′S 166°56′W / 84.933°S 166.933°W / -84.933; -166.933. A Y-shaped...

possesses a hexagonal crystal system. Aquamarine mainly forms in granite pegmatites and hydrothermal veins, and it is a very lengthy process that can take...

of these are concentrated in exceptionally coarse-grained rocks called pegmatites that are typically found in dikes and veins near larger igneous masses...