breyite

{{Infobox mineral|name=Breyite|formula=Ca_3.01(2)Si_2.98(2)O₉

|IMAsymbol=Byi{{Cite web|title=Breyite|url=https://www.mindat.org/min-53167.html|access-date=2022-01-15|website=www.mindat.org}}

|system=Triclinic|symmetry=P{{overbar|1}}|unit cell=a₀ = 6.6970(4) Å,

b₀= 9.2986(7) Å,

c₀ = 6.6501(4) Å,

α = 83.458(6)°,

β = 76.226(6)°,

γ = 69.581(7)°|cleavage=not observed|luster=vitreous|fluorescence=non-fluorescent|density=3.072 g/cm³|references={{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 }}|colour=colorless}}

Breyite is a high pressure calcium silicate mineral (CaSiO₃) found in diamond inclusions.{{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}} It is the second most abundant inclusion after ferropericlase, for diamonds with a deep Earth origin.{{Cite web|title=Breyite|url=https://www.mindat.org/min-53167.html|access-date=2022-01-15|website=www.mindat.org}}{{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}} 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.File:CaSiO3 Phase Diagram.png