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Paqueite

A valid IMA mineral species
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06088890017866585686719.jpg
Paqueite, etc.

Allende meteorite, Pueblito de Allende, Chihuahua, Mexico
06088890017866585686719.jpg
Paqueite, etc.

Allende meteorite, Pueblito de Allende, Chihuahua, Mexico
06088890017866585686719.jpg
Paqueite, etc.

Allende meteorite, Pueblito de Allende, Chihuahua, Mexico
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About PaqueiteHide

03864390017272472268504.jpg
Julie M. Paque
Formula:
Ca3TiSi2(Al,Ti,Si)3O14
End-member formula: Ca3TiSi2(Al2Ti)O14
Crystal System:
Trigonal
Name:
in honour of Julie M. Paque (1958 - ), cosmochemist at the California Institute of Technology, USA.
The Al analogue of qeltite.

A new Ti-rich silicate in Ca-Al-rich inclusion (CAI). Known as synthetic phase. Similar phase is known from Esebi C2 chondrite.

Chemistry very similar to that of hutcheonite. Similar element combination is also found in grossmanite.

Presumably a product of late-stage crystallization.


Unique IdentifiersHide

Mindat ID:
43931
Long-form identifier:
mindat:1:1:43931:4

IMA Classification of PaqueiteHide

IMA status:
Approved
IMA Formula:
Ca3Ti4+Si2(Al,Ti4+,Si)3O14
Approval year:
2013

Classification of PaqueiteHide

Strunz-mindat (2026):
9.HA.42

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
PaqIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Chemistry of PaqueiteHide

Mindat Formula:
Ca3TiSi2(Al,Ti,Si)3O14

End-member formula: Ca3TiSi2(Al2Ti)O14
Element Weights:
Element% weight
O42.326 %
Ca22.720 %
Al15.295 %
Si10.614 %
Ti9.045 %

Calculated from ideal end-member formula.
Elements listed:
Al, Ca, O, Si, Ti - search for minerals with similar chemistry
Common Impurities:
Na,V,(Sc,Mg)

Crystallography of PaqueiteHide

Crystal System:
Trigonal
Class (H-M):
32 - Trapezohedral
Space Group:
P321
Setting:
P321
Cell Parameters:
a = 7.943 Å, c = 4.930 Å
Ratio:
a:c = 1 : 0.621
Unit Cell V:
269.37 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.879 Å(20)
3.093 Å(100)
2.821 Å(50)
2.821 Å(68)
2.600 Å(21)
2.300 Å(43)
1.908 Å(17)
1.789 Å(28)
Locality:
Allende meteorite, Pueblito de Allende, Chihuahua, Mexico
Comments:
From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 1: Primary nebular phases4.567-4.561
3 : Solar nebular condensates (CAIs, AOAs, URIs)>4.565

Type Occurrence of PaqueiteHide

Type Locality:
ⓘ Allende meteorite, Pueblito de Allende, Chihuahua, Mexico
General Appearance of Type Material:
micron-sized crystals, within Al-rich melilite
Place of Conservation of Type Material:
Type material is deposited in the collections of the Smithsonian Institution’s National Museum of Natural History, Washington DC, USA, registration number USNM 7617
Associated Minerals at Type Locality:
AnorthiteBeckettiteBurnettiteCorundumCoulsonite
DavisiteGrossmaniteGrossularHercyniteHibonite
Melilite GroupPerovskiteSpinel

Synonyms of PaqueiteHide

Other Language Names for PaqueiteHide

Dutch:Paqueiet
German:Paqueit

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Paqueite associated with GrossmaniteCaTi3+ AlSiO6
2 photos of Paqueite associated with Melilite GroupCa2M(XSiO7)
1 photo of Paqueite associated with BurnettiteCaVAlSiO6
1 photo of Paqueite associated with SpinelMgAl2O4

Related Minerals - Strunz-mindat GroupingHide

9.HA.ShinichengiteCa5[BSi2O7(OH)2]2 · 6H2OTric. 1 : P1
9.HA.Kalyuzhnyite-(Ce)NaKCaSrCeTi(Si8O21)OF(H2O)3Mon. 2/m : P2/b
9.HA.MoragiteCa3TiSi2(Al2Si)O14Trig. 32 : P321
9.HA.05ErtixiiteNa2Si4O9Iso.
9.HA.10KenyaiteNa2Si22O41(OH)8 · 6H2OMon.
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm(2/m2/m2/m) : Cmma
9.HA.35DemagistrisiteBaCa2Mn3+4(Si3O10)(Si2O7)(OH)4 · 3H2OOrth. mm2 : Amm2
9.HA.37DonwilhelmsiteCaAl4Si2O11Hex. 6/mmm(6/m2/m2/m) : P63/mmc
9.HA.40KasatkiniteBa2Ca8B5Si8O32(OH)3 · 6H2O Mon.
9.HA.40'Igumnovite'Ca3Al2[SiO4]2[◻Cl4]Iso.
9.HA.42QeltiteCa3TiSi2(Fe3+2Si)O14Trig. 32 : P321
9.HA.45RippiteK2(Nb,Ti)2(Si4O12)O(O,F)Tet.
9.HA.47ZagamiiteCaAl2Si3.5O11Hex. 6/mmm(6/m2/m2/m) : P63/mmc
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2OMon.
9.HA.50'α-Carnegieite'NaAlSiO4
9.HA.52'Atheriastite'near Ca5MgFeAl6Si8O32 · 5H2O
9.HA.55'Foshallasite'Ca3[Si2O7] · 3H2O(?)
9.HA.57'Bhreckite'
9.HA.60NagelschmidtiteCa7(SiO4)2(PO4)2Hex. 6 : P61
9.HA.65Caryochroite[Na(Sr0.5Ca0.5)Mg]3[Fe3+8Mn(Fe2+0.5◻0.5)]10(Ti2Si12O37)(OH)14(H2O)3 Mon. 2/m
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or nearOrth.
9.HA.75TacharaniteCa12Al2Si18O33(OH)36Mon.
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2OTric. 1 : P1
9.HA.85DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4-x) · 2H2OMon.
9.HA.90TiettaiteK4Na12Fe3+Si16O41(OH)4 · 2H2OOrth. mmm(2/m2/m2/m) : Cmcm

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for PaqueiteHide

References for PaqueiteHide

Localities for PaqueiteHide

Showing 3 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Israel
 
  • Southern District
    • Beersheba Subdistrict
      • Tamar Regional Council
        • Hatrurim Basin
Galuskin et al. (2025)
          • Wadi Zohar
Galuskin et al. (2022)
Mexico (TL)
 
  • Chihuahua
    • Pueblito de Allende
Williams et al. (2013) +2 other references
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