{{Short description|Silicide mineral}} {{Infobox mineral | name = Hapkeite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Native element minerals | formula = Fe<sub>2</sub>Si | IMAsymbol = Hpk<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = | strunz = 1.BB.35 | system = Isometric | class = Hexoctahedral (m{{overline|3}}m) <br/>H-M symbol: (4/m {{overline|3}} 2/m) | symmetry = ''P''m{{overline|3}}m | unit cell = a = 2.831 Å; Z = 1 | color = silvery, with a slight tarnish | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = metallic | streak = | diaphaneity = opaque | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref>{{Cite web|url = http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1818.pdf|title = Lunar and Planetary Science XXXIV|date = 2003|accessdate = |website = |publisher = |last = Anand|first = M}}</ref><ref name=Mindat>[http://www.mindat.org/min-26419.html Mindat]</ref><ref name=Webmin>[http://webmineral.com/data/Hapkeite.shtml Webmineral data]</ref> }}
'''Hapkeite''' is a mineral discovered in the Dhofar 280 meteorite found in 2000 in Oman on the Arabian Peninsula. The meteorite is believed to originate from the Moon; specifically, it appears to be a fragment of lunar highland breccia. Hapkeite's composition is of silicon and iron, and it is similar to other silicon-iron minerals found on Earth. An impact on the Moon is thought to have launched the partially molten or vaporized material into orbit.
Due to its 1:2 composition of silicon-iron, hapkeite was given the chemical formula Fe<sub>2</sub>Si. It occurs as opaque, yellowish to silvery microscopic isometric crystals.
It is named after Bruce Hapke, who predicted the presence and importance of vapor-deposited coatings on lunar soil grains (space weathering).<ref name=Webmin/>
Beside hapkeite, other natural iron silicide minerals include gupeiite, naqite, linzhiite, luobusaite, suessite, xifengite, and zangboite.<ref name=Mindat />
==See also== * Glossary of meteoritics *List of minerals *List of minerals named after people
==References== {{Reflist}} *[http://www.pnas.org/cgi/content/abstract/101/18/6847?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Hapkeite&searchid=1134505993735_20542&stored_search=&FIRSTINDEX=0&journalcode=pnas Space weathering on airless planetary bodies: Clues from the lunar mineral hapkeite 2004 PNAS]
{{Meteorites}}
Category:Iron(II) minerals Category:Meteorite minerals Category:Cubic minerals Category:Minerals in space group 221 Category:Native element minerals