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Howardite
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<h2 id="characteristics">Characteristics</h2> <p>They are a <a href="/facts/Regolith/EdXuHK56">regolith</a> <a href="/facts/Breccia/fEmNFy8W">breccia</a> consisting mostly of <a href="/facts/Eucrite/M311uJ40">eucrite</a> and <a href="/facts/Diogenite/LlHwPNDe">diogenite</a> fragments, although carbonaceous <a href="/facts/Chondrule/eEcYvcoq">chondrules</a> and impact melt can also occur. The rock formed from impact ejecta which was later buried by newer impacts and <a href="/facts/Lithification/XoVlvd5J">lithified</a> due to the pressure from overlying layers. <a href="/facts/Regolith/EdXuHK56">Regolith</a> <a href="/facts/Breccia/fEmNFy8W">breccias</a> are not found on <a href="/facts/Earth/HLLmDfj0">Earth</a> due to a lack of regolith on bodies which have an <a href="/facts/Celestial_body_atmosphere/oUpLaGRF">atmosphere</a>. </p> <h2 id="name">Name</h2> <p>Howardites are named for <a href="/facts/Edward_Howard_(scientist)/sPS4gu73">Edward Howard</a>, a pioneer of <a href="/facts/Meteoritics/8foYPk51">meteoritics</a>. An arbitrary divide between howardites and the polymict eucrites is a 9:1 ratio of eucrite to <a href="/facts/Diogenite/LlHwPNDe">diogenite</a> fragments. </p> <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://www.meteorites.com.au/collection/achondrites.html#Howardites">Howardite images</a> - Meteorites Australia</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Harry Y. McSween, Meteorites and their parent planets. Cambridge University Press, 1999. ISBN 0-521-58751-4, ISBN 978-0-521-58751-8. - p.129 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Howardite - daviddarling.info <a href="http://www.daviddarling.info/encyclopedia/H/howardite.html" target="_blank">http://www.daviddarling.info/encyclopedia/H/howardite.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Meteoritical Bulletin Database: Howardites <a href="http://www.lpi.usra.edu/meteor/metbull.php?sea=&sfor=names&ants=&falls=&valids=&stype=contains&lrec=500&map=ge&browse=&country=All&srt=name&categ=Howardites" target="_blank">http://www.lpi.usra.edu/meteor/metbull.php?sea=&sfor=names&ants=&falls=&valids=&stype=contains&lrec=500&map=ge&browse=&country=All&srt=name&categ=Howardites</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>