Breyite

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Breyite
General
CategoryMinerals
FormulaCa3.01(2)Si2.98(2)O9
IMA symbolByi[1]
Crystal systemTriclinic
Space groupP1
Unit cella0 = 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)°
Identification
Colourcolorless
Cleavagenot observed
Lustervitreous
Density3.072 g/cm3
Ultraviolet fluorescencenon-fluorescent
References[2]

Breyite is a high pressure calcium silicate mineral (CaSiO3) found in diamond inclusions.[3][4] It is the second most abundant inclusion after ferropericlase, for diamonds with a deep Earth origin.[5][4] 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
CaSiO3 phase diagram showing Breyite is stable around 3-9 GPa[6]

References

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