{{Infobox mineral | name = Sinoite | category = Silicate mineral | boxwidth = | boxbgcolor = | image = Sinoite.png | caption = Crystal structure of sinoite. Atoms: red – O, blue – N, gray – Si.<ref name=str/> | formula = Si<sub>2</sub>N<sub>2</sub>O | IMAsymbol = Sno<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.DB.10 | dana = 1.3.9.1 | system = Orthorhombic | class = Pyramidal (mm2) <br/>H-M symbol: (mm2) | symmetry = ''C''mc2<sub>1</sub> | unit cell = a = 8.84 Å, b = 5.47 Å <br/>c = 4.83 Å, Z = 4 | color = From colorless to light gray | twinning = | cleavage = None | fracture = | tenacity = | mohs = | luster = Vitreous | refractive = n<sub>α</sub> = 1.740<br/> n<sub>β</sub> = 1.855<br/> n<sub>γ</sub> = 1.855 | opticalprop = Biaxial (-) | birefringence = δ = 0.115 | pleochroism = | streak = White | gravity = 2.83 | diaphaneity = Transparent to translucent | references = <ref>[http://rruff.geo.arizona.edu/doclib/hom/sinoite.pdf Sinoite]. Handbook of Mineralogy</ref><ref name=mindat>[http://www.mindat.org/min-3676.html Sinoite]. Mindat.org</ref><ref name=webmin>[http://webmineral.com/data/Sinoite.shtml Sinoite]. Webmineral</ref> }}
'''Sinoite''' is a rare mineral with the chemical formula Si<sub>2</sub>N<sub>2</sub>O. It was first found in 1905 in chondrite meteorites and identified as a distinct mineral in 1965. Sinoite crystallizes upon meteorite impact as grains smaller than 0.2 mm surrounded by Fe-Ni alloys and the mineral enstatite. It is named after its SiNO composition and can be prepared in the laboratory as a silicon oxynitride ceramic.<ref name=j1/>
The crystalline structure of silicon oxynitride is built by SiN<sub>3</sub>O tetrahedra connected through oxygen atoms along the ''c'' axis and through nitrogen atoms perpendicular to it. The strong covalent bonding of this structure results in high flexural strength and resistance to heating and oxidation up to temperatures of about 1600 °C.<ref name=b1/>
{{clear|left}} ==References== <references> <ref name="b1">{{cite book|author=Ralf Riedel|title=Ceramics science and technology: Structures|url=https://books.google.com/books?id=I-WFvgkBiEMC&pg=PA97|accessdate=8 October 2011|date=18 April 2008|publisher=Wiley-VCH|isbn=978-3-527-31155-2|pages=97–|author-link=Ralf Riedel}}</ref> <ref name="j1">{{cite journal|url=http://www.minsocam.org/msa/ammin/toc/Articles_Free/1997/Rubin_p1001-1006_97.pdf|journal=American Mineralogist|author=A. E. Rubin|title=Sinoite (Si<sub>2</sub>N<sub>2</sub>O): Crystallization from EL chondrite impact melts|volume=82|page=1001|year=1997|issue=9–10|doi=10.2138/am-1997-9-1016|bibcode=1997AmMin..82.1001R|s2cid=128629202}}</ref> <ref name="str">{{cite journal|title=Solid Solubility of Aluminum in O'-SiAlON|journal=J. Am. Ceram. Soc.|author= Ohashi, Masayoshi|year=1993|volume=76|pages=2112–2114|doi=10.1111/j.1151-2916.1993.tb08343.x|issue=8|display-authors=etal}}</ref> </references>
Category:Native element minerals Category:Orthorhombic minerals Category:Minerals in space group 36