pallasite


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pallasite

(pal -ă-sÿt) See stony-iron meteorite.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pallasite

 

a rare stony-iron meteorite, named after the first extant meteorite of this type, Pallas iron, discovered in Siberia by the schoolteacher Medvedev and brought to St. Petersburg on the instructions of P. S. Pallas in 1772. Pallasites are composed of approximately equal quantities of nickel iron and olivine. The unique pallasite structure indicates that these meteorites were formed during the absence of gravitational force, or at least of significant gravitational force.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

pallasite

[′pal·ə‚sīt]
(geology)
A stony-iron meteorite composed essentially of large single glassy crystals of olivine embedded in a network of nickel-iron.
An ultramafic rock, of either meteoric or terrestrial origin, which contains more than 60% iron in the former, or more iron oxides than silica in the latter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
How could a scientist of his presumed caliber discover an exotic 10-ton pallasite and not record it in his journal?
Ilimaes is another pallasite found in the Atacama Desert about 50 years after Imilac and 170 miles farther south.
"The best, coolest ones I keep for myself." His current darling is the 571-kilogram Esquel pallasite, the largest of its kind in the world.
Sometimes irons are laced with silicate minerals, resulting in attractive (and valuable) specimens called mesosiderites or pallasites.
Stony-irons have three possible classes: pallasites, mesosiderites, and lodranites.
Norton begins with chondrites, the primitive stones that have survived from the earliest times in solar-system history, and methodically works his way to exotic types like pallasites (samples from the core-mantle boundaries of asteroids that have been smashed apart) and meteorites from the Moon and Mars.
For one, it is the granddaddy of the meteorite class now dubbed pallasites. The circumstances of its landing - seemingly as gentle as a marshmallow landing on a featherbed - are a mystery, but its contribution to the founding of the science of meteoritics is well established.
Then in 1863 the work of the German mineralogist Gustav Rose established the class of stony-iron meteorites called pallasites, the subclasses of which have varying amounts of iron, nickel, and olivine.