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{{short description|Type of meteorite}}
{{infobox meteorite subdivision
{{infobox meteorite subdivision
|Subdivision = Group
|Subdivision = Group
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|Structural_classification = ?
|Structural_classification = ?
|Parent_body = Possibly [[6 Hebe]], less likely [[3 Juno]] & [[7 Iris]]
|Parent_body = Possibly [[6 Hebe]], less likely [[3 Juno]] & [[7 Iris]]
|Composition = [[Iron]] ~25-31%, [[bronzite]] (an [[orthopyroxene]]), [[olivine]] (with characteristic [[fayalite]] (Fa) content 16 to 20 mol%), [[nickel-iron]] 15-19%, [[troilite]] 5%
|Composition = [[Iron]] ~25–31%, [[bronzite]] (an [[orthopyroxene]]), [[olivine]] (with characteristic [[fayalite]] (Fa) content 16 to 20 mol%), [[nickel-iron]] 15–19%, [[troilite]] 5%
|Petrologic_type = 3 (~2.5%), 5 (40%), 4 & 6 (57.5%)
|Petrologic_type = 3 (~2.5%), 5 (40%), 4 & 6 (57.5%)
|Number_of_specimens =
|Number_of_specimens =
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|Image2_caption = Nuevo Mercurio, H5
|Image2_caption = Nuevo Mercurio, H5
}}
}}
The '''H type''' [[ordinary chondrite]]s are the most common type of [[meteorite]], accounting for approximately 40% of all those catalogued, 46% of the ordinary chondrites, and 44% of the [[chondrite]]s.<ref>[http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml Natural History Museum, meteorite catalogue]</ref> The ordinary chondrites are thought to have originated from three parent asteroids, with the fragments making up the '''H chondrite''', [[L chondrite]] and [[LL chondrite]] groups respectively.<ref>[http://www.youtube.com/watch?v=BNkS1uHUbq8&t=34m39s NASA (YouTube) – Dr. David Kring – Asteroid Initiative Workshop Cosmic Explorations Speakers Session]</ref>
The '''H type''' [[ordinary chondrite]]s are the most common type of [[meteorite]], accounting for approximately 40% of all those catalogued, 46% of the ordinary chondrites, and 44% of all [[chondrite]]s.<ref>{{Cite web |url=http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml |title=Natural History Museum, meteorite catalogue |access-date=2005-11-29 |archive-date=2006-05-03 |archive-url=https://web.archive.org/web/20060503223656/http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml |url-status=dead }}</ref> The ordinary chondrites are thought to have originated from three parent asteroids, whose fragments make up the '''H chondrite''', [[L chondrite]] and [[LL chondrite]] groups respectively.<ref>[https://www.youtube.com/watch?v=BNkS1uHUbq8&t=34m39s NASA (YouTube) – Dr. David Kring – Asteroid Initiative Workshop Cosmic Explorations Speakers Session]</ref>


== Name ==
== Name ==
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== Parent body ==
== Parent body ==
A probable parent body for this group is the [[S-type asteroid]] [[6 Hebe]], with less likely candidates being [[3 Juno]] and [[7 Iris]].<ref>[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998M%26PS...33.1281G&amp;db_key=AST&amp;data_type=HTML&amp;format=&amp;high=438c93072f28336 M. J. Gaffey & S. L. Gilbert ''Asteroid 6 Hebe: The probable parent body of the H-Type ordinary chondrites and the IIE iron meteorites''], [[Meteoritics & Planetary Science]], Vol. 33, p. 1281 (1998).</ref> It is supposed that these meteorites arise from impacts onto small [[near-earth asteroid]]s broken off from [[6 Hebe]] in the past, rather than originating from 6 Hebe directly.
A probable parent body for this group is the [[S-type asteroid]] [[6 Hebe]], with less likely candidates being [[3 Juno]] and [[7 Iris]].<ref>[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998M%26PS...33.1281G&amp;db_key=AST&amp;data_type=HTML&amp;format=&amp;high=438c93072f28336 M. J. Gaffey & S. L. Gilbert ''Asteroid 6 Hebe: The probable parent body of the H-Type ordinary chondrites and the IIE iron meteorites''], [[Meteoritics & Planetary Science]], Vol. 33, p. 1281 (1998).</ref> It is supposed that these meteorites arise from impacts onto small [[near-Earth asteroid]]s broken off from [[6 Hebe]] in the past, rather than originating from 6 Hebe directly.


The '''H chondrites''' have very similar trace element abundances and [[Oxygen]] isotope ratios to the [[IIE iron meteorite]]s, making it likely that they both originate from the same parent body.
The '''H chondrites''' have very similar trace element abundances and [[Oxygen]] isotope ratios to the [[IIE iron meteorite]]s, making it likely that they both originate from the same parent body.


==Iron==
==Iron==
Their high iron abundance is about 25-31% by weight. Over half of this is present in metallic form, making these meteorites strongly magnetic despite the stony [[chondritic]] appearance.
Their high iron abundance is about 25–31% by weight. Over half of this is present in metallic form, making these meteorites strongly magnetic despite the stony [[chondritic]] appearance.


==Mineralogy==
==Mineralogy==
The most abundant minerals are [[bronzite]] (an [[orthopyroxene]]), and [[olivine]]. Characteristic is the [[fayalite]] (Fa) content of the olivine of 16 to 20&nbsp;mol%. They contain also 15-19% of [[nickel-iron]] metal and about 5% of [[troilite]]. The majority of these meteorites have been significantly [[Metamorphic rock|metamorphosed]], with over 40% being in [[Chondrite#Petrologic types|petrologic class]] 5, most of the rest in classes 4 and 6. Only a few (about 2.5%) are of the largely unaltered petrologic class 3.
The most abundant minerals are [[bronzite]] (an [[orthopyroxene]]), and [[olivine]]. Characteristic is the [[fayalite]] (Fa) content of the olivine of 16 to 20&nbsp;mol%. They contain also 15–19% of [[nickel-iron]] metal and about 5% of [[troilite]]. The majority of these meteorites have been significantly [[Metamorphic rock|metamorphosed]], with over 40% being in [[Chondrite#Petrologic types|petrologic class]] 5, most of the rest in classes 4 and 6. Only a few (about 2.5%) are of the largely unaltered petrologic class 3.


==Gallery==
==Gallery==
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==External links==
==External links==
*[http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml The Catalogue of Meteorites]
*[http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml The Catalogue of Meteorites] {{Webarchive|url=https://web.archive.org/web/20060503223656/http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml |date=2006-05-03 }}


{{Meteorites}}
{{Meteorites}}

Latest revision as of 08:11, 24 December 2022

H chondrite
— Group —
Weston meteorite, H4
TypeChondrite
Structural classification?
ClassOrdinary chondrite
Subgroups
  • H3
  • H4
  • H5
Parent bodyPossibly 6 Hebe, less likely 3 Juno & 7 Iris
CompositionIron ~25–31%, bronzite (an orthopyroxene), olivine (with characteristic fayalite (Fa) content 16 to 20 mol%), nickel-iron 15–19%, troilite 5%
Petrologic type3 (~2.5%), 5 (40%), 4 & 6 (57.5%)
Alternative namesBronzite chondrites, Olivine bronzite chondrites
Nuevo Mercurio, H5

The H type ordinary chondrites are the most common type of meteorite, accounting for approximately 40% of all those catalogued, 46% of the ordinary chondrites, and 44% of all chondrites.[1] The ordinary chondrites are thought to have originated from three parent asteroids, whose fragments make up the H chondrite, L chondrite and LL chondrite groups respectively.[2]

Name[edit]

The name comes from their High iron abundance, with respect to other ordinary chondrites.

Historically, the H chondrites have been named bronzite chondrites or olivine bronzite chondrites for the dominant minerals, but these terms are now obsolete.

Parent body[edit]

A probable parent body for this group is the S-type asteroid 6 Hebe, with less likely candidates being 3 Juno and 7 Iris.[3] It is supposed that these meteorites arise from impacts onto small near-Earth asteroids broken off from 6 Hebe in the past, rather than originating from 6 Hebe directly.

The H chondrites have very similar trace element abundances and Oxygen isotope ratios to the IIE iron meteorites, making it likely that they both originate from the same parent body.

Iron[edit]

Their high iron abundance is about 25–31% by weight. Over half of this is present in metallic form, making these meteorites strongly magnetic despite the stony chondritic appearance.

Mineralogy[edit]

The most abundant minerals are bronzite (an orthopyroxene), and olivine. Characteristic is the fayalite (Fa) content of the olivine of 16 to 20 mol%. They contain also 15–19% of nickel-iron metal and about 5% of troilite. The majority of these meteorites have been significantly metamorphosed, with over 40% being in petrologic class 5, most of the rest in classes 4 and 6. Only a few (about 2.5%) are of the largely unaltered petrologic class 3.

Gallery[edit]

  • Gao-Guenie, H5
    Gao-Guenie, H5
  • H5 Dar Bou Nali South Morocco
    H5 Dar Bou Nali South Morocco

See also[edit]

References[edit]

  1. ^ "Natural History Museum, meteorite catalogue". Archived from the original on 2006-05-03. Retrieved 2005-11-29.
  2. ^ NASA (YouTube) – Dr. David Kring – Asteroid Initiative Workshop Cosmic Explorations Speakers Session
  3. ^ M. J. Gaffey & S. L. Gilbert Asteroid 6 Hebe: The probable parent body of the H-Type ordinary chondrites and the IIE iron meteorites, Meteoritics & Planetary Science, Vol. 33, p. 1281 (1998).

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=H_chondrite&oldid=1129243239"