Very large sheets or crystals of muscovite form in a pegmatite.    From Wordnik.com.  [Mica] Reference

The most important sources of sheet mica are the pegmatite deposits.    From Wordnik.com.  [Mica] Reference

This mineral is typical of a special igneous rock known as a pegmatite.    From Wordnik.com.  [Cesium] Reference

As Pete talked with Packy, Little Will studied the cracks in the pegmatite.    From Wordnik.com.  [Elephant Song]

Both of these minerals are typical of a special igneous deposit known as a pegmatite.    From Wordnik.com.  [Rubidium] Reference

A pegmatite is an extremely slow-cooling igneous rock in which very large crystals can form.    From Wordnik.com.  [Mica] Reference

Commercial quantities of spodumene are in a special igneous rock deposit that geologists call a pegmatite.    From Wordnik.com.  [Lithium] Reference

They consist chiefly of granulitic quartzose schists and felspathic gneisses, permeated in places by strings and veins of pegmatite.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

Carolina sapphire has been found in pegmatite dikes.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

(TSX VENTURE: MUM) to earn a 100% interest in a pegmatite project.    From Wordnik.com.  [Marketwire - Breaking News Releases]

Muscovite mica occurs principally in the granitic pegmatite dikes.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Emeralds have been found in pegmatite dikes in North Carolina and New.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

EagleRidge Minerals acquires REE/lithium pegmatite field in Southeast Manitoba.    From Wordnik.com.  [WN.com - Articles related to London Mining to move into profit with mine launch] Reference

Granite and pegmatite were round some lagoons near the creek from the southward.    From Wordnik.com.  [Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845] Reference

Some of the graphite also occurs in pegmatite intrusives and adjacent wall rocks.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Four additional pegmatite veins have been mapped that may also have Tin potential.    From Wordnik.com.  [Latest News - Yahoo!7 News] Reference

In this area, at least eight pegmatite trends with mapped strike lengths of 65 m to.    From Wordnik.com.  [FinanzNachrichten.de: Aktuelle Nachrichten] Reference

A channel sample taken from the 5+ metre wide pegmatite assayed 0. 86% lithium over 90cm.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The results indicate the main pegmatite bodies dip approximately 65 degrees to the southeast.    From Wordnik.com.  [FinanzNachrichten.de: Aktuelle Nachrichten] Reference

Three pegmatite based operations are being evaluated, one each in Australia (Galaxy Resources).    From Wordnik.com.  [SeekingAlpha.com: Home Page] Reference

The deep-zone minerals are not unlike the pegmatite minerals in their grouping and associations.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

The country was very mountainous; granitic and pegmatite ranges bounded the valley on both sides.    From Wordnik.com.  [Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845] Reference

The Virginia production comes from pegmatite dikes cutting through gabbros, syenites, and gneisses.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Mantis reports 2878 g/t rubidium over 9-meter width from its Case pegmatite, lithium-rare-element project.    From Wordnik.com.  [WN.com - Articles related to Obama ripped on energy] Reference

S. 78 degrees E. cut by numerous pegmatite dikes, having a strike N. 30 degrees W. and a dip 79 degrees W.    From Wordnik.com.  [The Long Labrador Trail] Reference

It will allow Nemaska to better understand the distribution of the pegmatite and to sample it systematically.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The zirconium silicate, zircon, is a fairly common accessory constituent of granitic rocks and pegmatite veins.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Work will be supervised by Carey Galeschuk who has over a decade of pegmatite exploration experience in the region.    From Wordnik.com.  [Marketwire - Breaking News Releases]

These scintillometer survey anomalies are hosted by pegmatite dykes with strike length potential of several hundred meters.    From Wordnik.com. Reference

There were several specimens in it that I can still recall acutely, one of which was spodumene collected from a New England pegmatite.    From Wordnik.com.  [About.com Geology] Reference