{{Short description|Rare silicate mineral}} {{Infobox mineral | name = Chibaite | boxwidth = | boxbgcolor = | image = Chibaite & Bosoite.jpg | imagesize = | alt = | caption = White crystals of the rare silica-hydrocarbon minerals chibaite (IMA 2008-067) and bosoite (IMA 2014-023) from the type and only known locality worldwide for both species: Arakawa, Minamiboso City, Chiba Prefecture, Honshu Island, Japan. | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = SiO<sub>2</sub>•n(CH<sub>4</sub>, C<sub>2</sub>H<sub>6</sub>, C<sub>3</sub>H<sub>8</sub>, i-C<sub>4</sub>H<sub>10</sub>) (n ≤ 3/17) | IMAsymbol=Cib<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 = 4.DA | dana = | system = Isometric | class = | symmetry = ''F''2/''d''{{overbar|3}} | unit cell = a = 19.3742 V=7,272.29 Å<sup>3</sup> | colour = white | habit = | twinning = | cleavage = | fracture = | tenacity = | toughness = | mohs = 7 | luster = Vitreous | streak = | diaphaneity = | gravity = 1.933 | density = | polish = | opticalprop = isotropic | refractive = 1.470 | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }}
'''Chibaite''' is a rare silicate mineral. It is a silica clathrate with formula {{chem|Si|O|2|•n(CH|4|,C|2|H|6|,C|3|H|8|,i-C|4|H|10|)|}} (n = 3/17 (max)). The mineral is cubic (diploidal class, m{{overline|3}}) and the silica hosts or traps various hydrocarbon molecules, such as methane, ethane, propane and isobutane.<ref name=Mindat>[http://www.mindat.org/min-39335.html Chibaite] on Mindat.org</ref><ref name=Elements>{{Cite web |url=http://www.elementsmagazine.org/archives/e8_3/e8_3_sn_jams.pdf |title=''The Discovery of Chibaite,'' Elements, June 2012, section: Japan Association of Mineralogical Sciences p. 230 |access-date=2014-03-19 |archive-date=2021-01-19 |archive-url=https://web.archive.org/web/20210119203430/http://www.elementsmagazine.org/archives/e8_3/e8_3_sn_jams.pdf |url-status=dead }}</ref>
Chibaite was first described for specimens collected from Arakawa, Minamibōsō, Chiba Prefecture, Honshu Island, Japan. The mineral was approved by the IMA in 2009.<ref name=Mindat/><ref name=Elements/>
==References== {{Reflist}} * [http://www.minsocam.org/msa/ammin/toc/Abstracts/2012_Abstracts/ND12_Abstracts/DiegoGatta_p2064_12.pdf Gatta, C. B., ''Chibaite,'' American Mineralogist, New Mineral Names, Volume 97, pp 2064–2072, 2012]
Category:Silicate minerals Category:Cubic minerals Category:Clathrates Category:Organic minerals Category:Minerals described in 2009 Category:Hydrocarbons
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