Chondrite

Chondrite

Chondrites are stony meteorites that have not been modified due to melting or differentiation of the parent body. They formed when various types of dust and small grains that were present in the early solar system accreted to form primitive asteroids. Prominent among the components present in chondrites are the enigmatic chondrules, millimeter-sized objects that originated as freely floating, molten or partially molten droplets in space; most chondrules are rich in the silicate minerals olivine and pyroxene. Chondrites also contain refractory inclusions (including Ca-Al Inclusions), which are among the oldest objects to form in the solar system, particles rich in metallic Fe-Ni and sulfides, and isolated grains of silicate minerals. The remainder of chondrites consists of fine-grained (micrometer-sized or smaller) dust, which may either be present as the matrix of the rock or may form rims or mantles around individual chondrules and refractory inclusions. Embedded in this dust are presolar grains, which predate the formation of our solar system and originated elsewhere in the galaxy.

Most meteorites that are recovered on Earth are chondrites: 86.2% of witnessed falls are chondrites, as are the overwhelming majority of meteorites that are found. There are currently over 27,000 chondrites in the world's collections. The largest individual stone ever recovered, weighing 1770 kg, was part of the Jilin meteorite shower of 1976. Chondrite falls range from single stones to extraordinary showers consisting of thousands of individual stones, as occurred in the Holbrook fall of 1912, where an estimated 14,000 stones rained down on northern Arizona.

Read more about Chondrite:  Origin and History, Types of Chondrites, Composition, Petrologic Types

Other articles related to "chondrite, chondrites":

Klaus Keil
... Find Hunter Classification Study (Meteorititics) Classification by type, class, clan and group Chondrite Carbonaceous chondrite CI CV CM CR CH CB CK CO C ungrouped Ordinary ...
6 Hebe - Major Meteorite Source
6 Hebe is the probable parent body of the H chondrite meteorites and the IIE iron meteorites ... Gilbert.) The spectrum of Hebe matches a mix of 60% H chondrite and 40% IIE iron meteorite material ... The IIE irons and H chondrites likely come from the same parent body, due to similar trace mineral and oxygen isotope ratios ...
Nininger Meteorite Award Winners
... Elston Accretion of the Murray Carbonaceous Chondrite and Implications Regarding Chondrule and Chondrite Formation 1967-1968 G ... Jeffrey Taylor On the Thermal History of Chondrites 1967-1968 Benjamin N ... Chou Gallium and Germanium in the Metal and Silicate Phases of L- and LL- Chondrites Implications for the Thermal History of the Chondrites 1971-1972 J ...
Meteorite Types - Traditional Classification Scheme
... One group of chondrites (CB) has over 50% metal by volume and contains meteorites that were called stony irons until their affinities with chondrites were recognized ... divided into two other categories chondrites (groups of meteorites that have undergone little change since their parent bodies originally formed and are characterized by the presence of chondrules), and ... I) Stony meteorites Chondrites Carbonaceous chondrite class CI chondrite (Ivuna-like) group CM-CO chondrite (mini-chondrule) clan CM chondrite (Mighei-like) group CO chondrite (Ornans-like) group CV-CK ...
Chondrite - Petrologic Types
... A chondrite's group is determined by its primary chemical, mineralogical, and isotopic characteristics (above) ... an LL5 chondrite belongs to the LL group and has a petrologic type of 5) ... alteration part of the system works as follows Type 1 was originally used to designate chondrites that lacked chondrules and contained large amounts of ...