# Breyite

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{{Infobox mineral|name=Breyite|formula=Ca<sub>3.01(2)</sub>Si<sub>2.98(2)</sub>O<sub>9</sub>
|IMAsymbol=Byi<ref>{{Cite web|title=Breyite|url=https://www.mindat.org/min-53167.html|access-date=2022-01-15|website=www.mindat.org}}</ref>
|system=Triclinic|symmetry=''P{{overbar|1}}''|unit cell=a<sub>0</sub> = 6.6970(4) Å, <br />
b<sub>0</sub>= 9.2986(7) Å, <br />
c<sub>0</sub> = 6.6501(4) Å, <br />
α = 83.458(6)°, <br />
β = 76.226(6)°, <br />
γ = 69.581(7)°|cleavage=not observed|luster=vitreous|fluorescence=non-fluorescent|density=3.072 g/cm<sup>3</sup>|references=<ref>{{cite journal |last1=Brenker |first1=Frank E. |last2=Nestola |first2=Fabrizio |last3=Brenker |first3=Lion |last4=Peruzzo |first4=Luca |last5=Harris |first5=Jeffrey W. |title=Origin, properties, and structure of breyite: The second most abundant mineral inclusion in super-deep diamonds |journal=American Mineralogist |date=1 January 2021 |volume=106 |issue=1 |pages=38–43 |doi=10.2138/am-2020-7513|bibcode=2021AmMin.106...38B |s2cid=231543488 |doi-access=free }}</ref>|colour=colorless}}

'''Breyite''' is a high pressure calcium silicate mineral (CaSiO<sub>3</sub>) found in diamond inclusions.<ref>{{Cite book|last1=Alderton|first1=David|title=Encyclopedia of Geology|last2=Elias|first2=Scott|publisher=Elsevier Science|year=2020|isbn=9780081029091|pages=467|language=en}}</ref><ref name=":0" /> It is the second most abundant inclusion after [ferropericlase](/source/ferropericlase), for diamonds with a deep Earth origin.<ref>{{Cite web|title=Breyite|url=https://www.mindat.org/min-53167.html|access-date=2022-01-15|website=www.mindat.org}}</ref><ref name=":0">{{Cite journal|last1=Brenker|first1=Frank E.|last2=Nestola|first2=Fabrizio|last3=Brenker|first3=Lion|last4=Peruzzo|first4=Luca|last5=Harris|first5=Jeffrey W.|date=2021-01-01|title=Origin, properties, and structure of breyite: The second most abundant mineral inclusion in super-deep diamonds|url=https://www.degruyter.com/document/doi/10.2138/am-2020-7513/html|journal=American Mineralogist|language=en|volume=106|issue=1|pages=38–43|doi=10.2138/am-2020-7513|bibcode=2021AmMin.106...38B |s2cid=231543488 |issn=1945-3027|url-access=subscription|doi-access=free}}</ref> Its occurrence can also indicate the host diamond's super-deep origin. This mineral is named after German mineralogist, petrologist and geochemist Gerhard P. Brey.thumb|CaSiO<sub>3</sub> phase diagram showing Breyite is stable around 3-9 GPa<ref>{{Cite journal|last1=Milani|first1=Sula|last2=Comboni|first2=Davide|last3=Lotti|first3=Paolo|last4=Fumagalli|first4=Patrizia|last5=Ziberna|first5=Luca|last6=Maurice|first6=Juliette|last7=Hanfland|first7=Michael|last8=Merlini|first8=Marco|date=2021-06-19|title=Crystal Structure Evolution of CaSiO3 Polymorphs at Earth's Mantle Pressures|journal=Minerals|volume=11|issue=6|pages=652|doi=10.3390/min11060652|bibcode=2021Mine...11..652M |issn=2075-163X|doi-access=free |hdl=11368/2993918|hdl-access=free}}</ref>|293x293px

== References ==
<references />

Category:Silicate minerals
Category:Calcium minerals
Category:High pressure science
Category:Diamond

{{silicate-mineral-stub}}

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Adapted from the Wikipedia article [Breyite](https://en.wikipedia.org/wiki/Breyite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Breyite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.