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Tissintite

A valid IMA mineral species
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Formula:
(Ca,◻)AlSi2O6
Specific Gravity:
3.395 (Calculated)
Crystal System:
Monoclinic
Name:
The mineral name is after the host Tissint meteorite, which in turn is named after the town of Tissint, Morocco, where the meteorite fell. It fell on 18 July 2011 and is only the fifth Martian meteorite that people have witnessed falling to Earth.
Ca-analogue ofjadeite. AC2/c clinopyroxene, containing 42–60 mol% of the Ca-Eskola component, by far the highest known.
A vacancy-rich, high-pressure clinopyroxene, with a composition essentially equivalent toplagioclase. Formed during a shock event severe enough to allow nucleation and growth of vacancy-rich clinopyroxene from a melt of not too calcic and not too sodic plagioclase composition that was neither too hot nor too cold (Ma et al. 2015), i.e. the meteor hit on Mars that ejected the meteorite material that reached earth.


IMA Formula:
(Ca,Na,◻)AlSi2O6
Approval year:
First published:
Type description reference:

Classification of Tissintite

Mineral Symbols

Crystallography of Tissintite
General Appearance of Type Material:

In maskelynite (shocked plagioclase) less than ∼25 μm of a shock melt pocket.
Place of Conservation of Type Material:
Type material is in Tissint sections UT1 and UT2 deposited in the Meteorite Collection of the Frank H. McClung Museum at the University of Tennessee, Knoxville, Tennessee, USA
Geological Setting of Type Material:
Commonly observed included within, or in contact with, shock-melt pockets in the Tissint meteorite, a depleted olivine-phyric shergottite fall from Mars.
Associated Minerals at Type Locality:
DiopsideFayaliteMaskelynite
Reference:
Ma, Chi, Tschauner, Oliver, Beckett, John R., Liu, Yang, Rossman, George R., Zhuravlev, Kirill, Prakapenka, Vitali, Dera, Przemyslaw, Taylor, Lawrence A. (2015) Tissintite, (Ca, Na, □)AlSi2O6, a highly-defective, shock-induced, high-pressure clinopyroxene in the Tissint martian meteorite.Earth and Planetary Science Letters, 422. 194-205doi:10.1016/j.epsl.2015.03.057

Synonyms of Tissintite

Relationship of Tissintite to other Species
Other Members of Clinopyroxene Subgroup:

AegirineNaFe3+Si2O6Mon. 2/m :B2/b
Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m :B2/b
Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :B2/b
BurnettiteCaVAlSiO6Mon. 2/m :B2/b
ClinoenstatiteMgSiO3Mon. 2/m :P21/b
ClinoferrosiliteFe2+2Si2O6Mon. 2/m :P21/b
ColomeraiteNaTi3+Si2O6Mon. 2/m :B2/b
DavisiteCaScAlSiO6Mon. 2/m :B2/b
DiopsideCaMgSi2O6Mon. 2/m :B2/b
EsseneiteCaFe3+[AlSiO6]Mon. 2/m :B2/b
GrossmaniteCaTi3+ AlSiO6Mon. 2/m :B2/b
HedenbergiteCaFe2+Si2O6Mon. 2/m :B2/b
JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m :B2/b
JervisiteNaSc3+Si2O6Mon. 2/m :B2/b
JohannseniteCaMn2+Si2O6Mon. 2/m :B2/b
KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m :P21/b
KosmochlorNaCrSi2O6Mon. 2/m :B2/b
KushiroiteCaAlAlSiO6Mon. 2/m :B2/b
NamansiliteNaMn3+Si2O6Mon. 2/m :B2/b
NatalyiteNaV3+Si2O6Mon. 2/m :B2/b
Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m :B2/b
Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :P21/b
RyabchikoviteCuMgSi2O6Mon. 2/m :P21/b
SpodumeneLiAlSi2O6Mon. 2/m :B2/b
UM2001-19-SiO:AlCaMgNa(Na,Mg,Ca)(Mg,Al)Si2O6Mon. 2/m :B2/b
UM2003-36-SiO:CaNaNaCrSi2O6 - CaMgSi2O6Mon. 2/m :B2/b

Related Minerals -Strunz-mindat GroupingMon. 2/m :B2/b9.DA.ProtoenstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbcn9.DA.RyabchikoviteCuMgSi2O6Mon. 2/m :P21/b9.DA.05Donpeacorite(Mn,Mg)MgSi2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.05EnstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.05FerrosiliteFe2+2Si2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.10ClinoenstatiteMgSiO3Mon. 2/m :P21/b9.DA.10ClinoferrosiliteFe2+2Si2O6Mon. 2/m :P21/b9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m :P21/b9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :P21/b9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m :B2/b9.DA.15DiopsideCaMgSi2O6Mon. 2/m :B2/b9.DA.15 vaJeffersoniteCa(Mn,Zn,Fe)Si2O69.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m :B2/b9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m :B2/b9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m :B2/b9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m :B2/b9.DA.15KushiroiteCaAlAlSiO6Mon. 2/m :B2/b9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :B2/b9.DA.15DavisiteCaScAlSiO6Mon. 2/m :B2/b9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m :B2/b9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m9.DA.25JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m :B2/b9.DA.25NamansiliteNaMn3+Si2O6Mon. 2/m :B2/b9.DA.25NatalyiteNaV3+Si2O6Mon. 2/m :B2/b9.DA.25AegirineNaFe3+Si2O6Mon. 2/m :B2/b9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m :B2/b9.DA.25KosmochlorNaCrSi2O6Mon. 2/m :B2/b9.DA.30SpodumeneLiAlSi2O6Mon. 2/m :B2/b9.DA.35HiroseiteFeSiO3Orth.mmm(2/m2/m2/m) :Pnma

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    • References for TissintiteⓘManicouagan impact structureSpray et al. (2023)
    Lithuania
     
    Miyahara et al. (2021)
    Morocco
     
    Pang et al. (2016)+1 other referenceWilliams et al. (2013)+2 other references
    Nigeria
     
    Ma et al. (2024)
    Northwest Africa Meteorites
     
    Fudge et al. (2018)
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