chondrules


Also found in: Dictionary, Thesaurus.

chondrules

(kon -droolz) Near-spherical bodies composed chiefly of silicates, with sizes between 0.2 mm and 4 mm, found embedded in chondrites. They are usually aggregates of olivine, (Mg,Fe)2 SiO4, and pyroxene (Mg,Fe)SiO3. They may also be single crystals, wholly glass, or crystal and glass, in a wide range of proportions. They appear to have been free fluid drops made spherical by surface tension and then solidified and crystallized. There is a possibility that these silicate drops were produced by lightning discharges in the dusty primitive solar nebula or that they are crystallized droplets of impact melt produced when two asteroids collided. Chondrulelike bodies have been found in lunar soils.
References in periodicals archive ?
In one specimen, found in Antarctica, they discovered a new type of building block called sulfide chondrules.
Showing that chondrules are as old as CAIs addresses a long-standing question of why chondrule formation should be delayed by up to 2 million years after CAIs.
Chondrules are older than Earth and are never found in terrestrial rocks, making their presence a definitive test for meteor-rights.
As chondrules cooled, iron-bearing minerals within them became magnetized like bits on a hard drive by the local magnetic field in the gas.
With their high precision measurements, they are able to date formation times for chondrules very precisely," he said.
After making a few small strokes of the file, examine the sample's exterior and interior for the presence of chondrules or shiny metal grains.
These findings suggest that chondrules formed from 2 million to 5 million years after inclusions appeared.
The origins of chondrules, which are typically about a millimetre across, are shrouded in mystery.
Basaltic achondrites lack the rounded particles, or chondrules, found inside most stony meteorites.
Scientists frequently find chondrules embedded in particles of interplanetary dust.
King at the University of Houston, scientists have been arguing over the origin of chondrules for two centuries.
Chondrites consist in large part of small igneous spheroids called chondrules (seen at lower left).