H chondrite

<h2 id="name">Name</h2>
<p>The name comes from their High iron abundance, with respect to other <a href="/facts/Ordinary_chondrite/9dysJBuy">ordinary chondrites</a>.
</p><p>Historically, the H chondrites have been named <i>bronzite chondrites</i> or <i>olivine bronzite chondrites</i> for the dominant minerals, but these terms are now obsolete.
</p>
<h2 id="parent-body">Parent body</h2>
<p>A probable parent body for this group is the <a href="/facts/S-type_asteroid/ewLP0dgH">S-type asteroid</a> <a href="/facts/6_Hebe/KmlqpR0z">6 Hebe</a>, with less likely candidates being <a href="/facts/3_Juno/5hQkurE0">3 Juno</a> and <a href="/facts/7_Iris/32DM41fM">7 Iris</a>.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> It is supposed that these meteorites arise from impacts onto small <a href="/facts/Near-Earth_asteroid/UwnPRnSN">near-Earth asteroids</a> broken off from  <a href="/facts/6_Hebe/KmlqpR0z">6 Hebe</a> in the past, rather than originating from 6 Hebe directly.
</p><p>The H chondrites have very similar trace element abundances and <a href="/facts/Oxygen/acyn6o8r">Oxygen</a> isotope ratios to the <a href="/facts/IIE_iron_meteorite/cVnuSk1Q">IIE iron meteorites</a>, making it likely that they both originate from the same parent body.
</p>
<h2 id="iron">Iron</h2>
<p>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 <a href="/facts/Chondritic/mbzbGm5A">chondritic</a> appearance.
</p>
<h2 id="mineralogy">Mineralogy</h2>
<p>The most abundant minerals are <a href="/facts/Bronzite/XpntUVJK">bronzite</a> (an <a href="/facts/Orthopyroxene/hWMTLF9o">orthopyroxene</a>), and <a href="/facts/Olivine/tLLL4rae">olivine</a>. Characteristic is the <a href="/facts/Fayalite/UaPIeQRs">fayalite</a> (Fa) content of the olivine of 16 to 20 mol%. They contain also 15–19% of <a href="/facts/Nickel-iron/dqyln0KA">nickel-iron</a> metal and about 5% of <a href="/facts/Troilite/tWP2rSj1">troilite</a>. The majority of these meteorites have been significantly <a href="/facts/Metamorphic_rock/JRp6dsCm">metamorphosed</a>, with over 40% being in <a href="/facts/Chondrite/mbzbGm5A">petrologic class</a> 5, most of the rest in classes 4 and 6. Only a few (about 2.5%) are of the largely unaltered petrologic class 3.
</p>
<h2 id="gallery">Gallery</h2>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Glossary_of_meteoritics/TbTPV1Ut">Glossary of meteoritics</a></li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml">The Catalogue of Meteorites</a> <a href="https://web.archive.org/web/20060503223656/http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml">Archived</a> 2006-05-03 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"Natural History Museum, meteorite catalogue". Archived from the original on 2006-05-03. Retrieved 2005-11-29. <a href="https://web.archive.org/web/20060503223656/http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml" target="_blank">https://web.archive.org/web/20060503223656/http://internt.nhm.ac.uk/jdsml/research-curation/projects/metcat/metsPerGroup.dsml</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>NASA (YouTube) – Dr. David Kring – Asteroid Initiative Workshop Cosmic Explorations Speakers Session <a href="https://www.youtube.com/watch?v=BNkS1uHUbq8&t=34m39s" target="_blank">https://www.youtube.com/watch?v=BNkS1uHUbq8&t=34m39s</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>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). <a href="http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998M%26PS...33.1281G&db_key=AST&data_type=HTML&format=&high=438c93072f28336" target="_blank">http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998M%26PS...33.1281G&db_key=AST&data_type=HTML&format=&high=438c93072f28336</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

H chondrite open-in-new

H chondrite