Chondrule


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chondrule

[′kän‚drül]
(geology)
A spherically shaped body consisting chiefly of pyroxene or olivine minerals embedded in the matrix of certain stony meteorites.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Chondrule

 

a circular formation averaging 0.5–1.0 mm in diameter that is the primary structural element of meteorites—chondrites (see). Three principal types are distinguished on the basis of texture: exocentric fan, grated, and porphyritic. Chondrules are rapidly cooled drops of molten silicate matter.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The new discovery is that the so-called chondrules were formed during the first three million years of the solar system's development as well.
Chondrules themselves formed through quick melting events in the dusty gas cloud -- the solar nebula -- that surrounded the young sun.
"The chondrules in other meteorites give us a range of different ages," lead researcher Brandon Johnson, a planetary scientist at Brown University, said in a (https://www.eurekalert.org/pub_releases/2016-12/bu-roc120716.php) statement .
UPDATE: Chondrules are among the oldest pieces of planetary building blocks, formed roughly 4.6 billion years ago during the solar system's first few million years.
Members of the subclass of stony meteorites known as achondrites are completely devoid of chondrules. Achondrites are igneous rocks from space that originated from parent bodies that melted.
They derive their name from their main component -- chondrules, which formed as molten droplets floating in space.
The overwhelming majority of chondrites contain spherical structures called chondrules (from the Greek word for "grain") and are thought to have formed around dust remnants from the primordial solar nebula that underwent heating and formed the earliest structures of our solar system.
In the ordinary chondrites, MacPherson's team studied both tiny, gray- white inclusions and small, silicate droplets known as chondrules. They found that a higher proportion of aluminum-26 appeared in the inclusions than in the chondrules.
"We can now use the isotopes to measure the age of different chondrules, parts of meteorites, and understand far more about the early part of our Solar System," one of the scientists, Johan Villeneuve, told BBC News.
In the equivalent of nine pages, you get a fast-forward account of how the solar system came to be, and in the process you are introduced to such terms as refractory inclusions, chondrules, and devolatilized.