Pictures from Google Image Search

pegmatite

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

pegmatite Very coarse-grained, igneous rock, usually of granitic composition, in which the individual crystals are at least 2.5 cm long. The crystals are often more than 1 m in length, and may be far larger. Crystallization occurs at a late stage, when the magma is enriched in volatiles and trace elements. Pegmatites may concentrate some rare elements (lithium, boron, fluorine, tantalum, niobium, rare earth elements, and uranium) to economic proportions.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

AILSA ALLABY and MICHAEL ALLABY. "pegmatite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 12 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "pegmatite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 12, 2009). http://www.encyclopedia.com/doc/1O13-pegmatite.html

AILSA ALLABY and MICHAEL ALLABY. "pegmatite." A Dictionary of Earth Sciences. 1999. Retrieved November 12, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-pegmatite.html

Learn more about citation styles

Related newspaper, magazine, and trade journal articles from HighBeam Research

(Including press releases, facts, information, and biographies)

Creating columns with AppleWorks
Newspaper article from: New Straits Times; 1/20/2000; ; 700+ words ; ...below Number of Columns, which is labelled: Variable Column Widths. Click...width for each column. If you have chosen 2 for number of columns, then you can...top of the second column. Figure 1 illustrates how columns can be used in...
Columns bringing regal style inside
Newspaper article from: The Milwaukee Journal Sentinel; 3/23/2003; ; 700+ words ; ...where she painted the column in the formal foyer solid black. Younginer said columns should complement, not...with low ceilings; wide columns work in large rooms with high ceilings. COLUMN STYLES Columns are indeed classic architectural...
Columns need repeat readers
Magazine article from: The Quill; 7/1/2003; ; 700+ words ; ...themselves a newspaper column. You have to earn it. Columns are given out by editors...reward reporters with a column for exceptional achievement...long, they gave you a column to shut you up. Some...journalists start writing columns after writing thousands...
HPLC columns thin down, speed up, and get simpler. (high performance liquid chromatography)(includes related article)
Magazine article from: R & D; 12/1/1994; ; 700+ words ; ...phases, cartridge column devices, and...systems. Microbore columns were first introduced...attractions of microbore columns. Since flow rate...square of the column's ID, researchers...conventional LC column," he says. Microbore columns are also becoming...
Edge-Column Slab Connections under Gravity and Lateral Loading
Magazine article from: ACI Structural Journal; 9/1/2008; ; 700+ words ; ...failure at the slab-column connection due to...the slabs and the columns. This kind of failure...research on edge slab-column connections had mostly...connections with square columns transferring gravity...involving rectangular columns are also very limited...related to slab-column ...
Column strengthening of M6 bridges
Magazine article from: Concrete; 3/1/2005; ; 700+ words ; ...corrosion of the concrete columns at the splash zone. Design option The column supports were assessed...at the top of the columns to reinforce the...installed the concrete column surface had to be...FRP varied on each column with thickening at the base of the columns, tapering from ...
Qualification of a chromatographic column
Magazine article from: Pharmaceutical Technology Europe; 5/1/2003; ; 700+ words ; ...focus on the reproducibility of column packing; choose appropriate...particularly for bioseparations. The column used is central to the performance...reproducible performance, columns must be qualified in an acceptable...of the critical elements of column qualification include identifying...
Eye on columns: when Macky Hill, design cooridinator, was building his own house, he wanted a traditional design on the outside, but an open floor plan on the inside--and columns--were the only way to achieve it.
Magazine article from: Walls & Ceilings; 10/1/2002; ; 700+ words ; ...Note: The rule is that columns should be no further...with the height of each column being 8 feet 6 inches...Columns were used. The columns themselves are load bearing...a traditional wooden column. "The columns are resistant to extreme...
Pulsed column and mixer-settler applications in solvent extraction
Magazine article from: JOM; 7/1/2003; ; 700+ words ; ...organic phases. Pulsed Columns A solvent extraction pulsed column is drastically different...whether the pulsed column is being operated as...talking about pulsed columns, refers to the percent...section of the pulsed column that is the dispersed...
Static column decode speeds up DRAM access time. (includes related article on designing a memory timer) (technical)
Magazine article from: EDN; 3/2/1989; ; 700+ words ; Static column decode speeds up DRAM access time If you...dependent on the memory bandwidth. And static column decoding can be a useful alternative to...and need to maximize throughput. Static column decode assumes same row address A static...

Related entries from encyclopedias, dictionaries, and thesauruses

column
Book article from: The Columbia Encyclopedia, Sixth Edition ...Egyptian architecture the columns were of gigantic size...Hellenic times, the column type known to have been...between the circular column and the rectangular entablature...Ionic, and Corinthian column types advanced toward...Romans. Although Greek columns always had vertical channels...
triumphal column
Book article from: A Dictionary of Architecture and Landscape Architecture ...formerly called the Antonine column . The form was used by...von Erlach for the twin columns of the Karlskirche...the Vendôme Column, Paris, by Gondoin...Many commemorative columns, however, have plain...7), and the Nelson Column (1839–42...
Winogradsky Column
Book article from: World of Microbiology and Immunology ...environmental niches throughout the column. The products of one microbe...microbe. The result is that the column becomes a self-supporting...incoming sunlight. Winogradsky columns are easily constructed, and...demonstrations. The Winogradsky column is named after Sergius Winogradsky...
The Durutti Column
Book article from: Contemporary Musicians The Durutti Column Avant-rock band Since the late-1970s, the Durutti Column has essentially served as the musical voice of Manchester...the lineup settled in together as the Durutti Column, one of the first non-punk underground bands...
Trajan's Column
Book article from: The Oxford Dictionary of Art ...since 1588. The shaft of the column is decorated with a spiral...the full-size cast of the column in the Victoria and Albert Museum, London. Columns had earlier been used in...statuary, but Trajan's Column was novel in its great size...

Find thousands of answers for hundreds of subjects at Smart QandA .

All answers verified by trusted sources at Encyclopedia.com

Try Smart QandA now!

For students and teachers!

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including:

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including: