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Unnamed (MSH UK-37A)

Valid as an unnamed mineral
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Formula:
Sr3NaCaY(CO3)6 · 3H2O
Colour:
White, Grey, Brown, Green-Grey
Lustre:
Dull
Crystal System:
Hexagonal
Name:
Currently unnamed - from Mont Saint-Hilaire, Quebec, Canada
Probably the Sr analogue of ewaldite. The correct name is UM1986-09-CO:CaHNaSrY.

The UM1992-05-CO:CaCeLaNaSr is suggested to be polymorphous, but its chemistry may slightly be different.

Occurs as barrel- and pagoda-shaped crystals, macroscopically indistinguishable from ewaldite, donnayite-(Y), and mckelveyite-(Y).

Environment: silicate cavities, carbonate cavities, pegmatites, and igneous breccia.


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Unique IdentifiersHide

Mindat ID:
27619
Long-form identifier:
mindat:1:1:27619:5

IMA Classification of Unnamed (MSH UK-37A)Hide

IMA status notes:
Unnamed (probably valid)

Classification of Unnamed (MSH UK-37A)Hide

Strunz-mindat (2026):
5.CC.05

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)

Physical Properties of Unnamed (MSH UK-37A)Hide

Lustre:
Dull
Transparency:
Opaque
Colour:
White, Grey, Brown, Green-Grey

Chemistry of Unnamed (MSH UK-37A)Hide

Mindat Formula:
Sr3NaCaY(CO3)6 · 3H2O
Element Weights:
Element% weight
O40.533 %
Sr31.711 %
Y10.725 %
C8.694 %
Ca4.835 %
Na2.773 %
H0.730 %

Calculated from ideal end-member formula.
O
Sr
Y
C
Ca
Na
H
Elements listed:
C, Ca, H, Na, O, Sr, Y - search for minerals with similar chemistry

Crystallography of Unnamed (MSH UK-37A)Hide

Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 5.193(1) Å, c = 12.25(1) Å
Ratio:
a:c = 1 : 2.359
Unit Cell V:
286.09 ų (Calculated from Unit Cell)
Morphology:
Barrel and Pagoda shaped crystals

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.50 Å(60)
4.23 Å(80)
3.023 Å(100)
2.596 Å(70)
2.391 Å(50)
1.976 Å(90)
Locality:
Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Synonyms of Unnamed (MSH UK-37A)Hide

Related Minerals - Strunz-mindat GroupingHide

5.CC.Bainbridgeite-(NdCe)Na2Ba2NdCe(CO3)6 · 3H2OTric. 1 : P1
5.CC.Yuchuanite-(Y)Y2(CO3)3 · H2OTric. 1 : P1
5.CC.Alicewilsonite-(YCe)Na2Sr2YCe(CO3)6 · 3H2OTric. 1 : P1
5.CC.05Donnayite-(Y)NaCaSr3Y(CO3)6 · 3H2OTric. 1 : P1
5.CC.05Alicewilsonite-(YLa)Na2Sr2YLa(CO3)6 · 3H2OTric. 1 : P1
5.CC.05Mckelveyite-(Nd)NaCaBa3Nd(CO3)6 · 3H2OMon. m : Bb
5.CC.05Mckelveyite-(Y)NaCaBa3Y(CO3)6 · 3H2OTric. 1 : P1
5.CC.05EwalditeBa(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2OHex. 6mm : P63mc
5.CC.05'UM1992-05-CO:CaCeLaNaSr'(Sr,Na,Y,REE,Ca,Ba)2(CO3)2 · H2OTrig. 3m : R3m
5.CC.05WeloganiteNa2Sr3Zr(CO3)6 · 3H2OTric. 1 : P1
5.CC.05Mckelveyite GroupA3B3(CO3)6 · 3H2O
5.CC.05Bainbridgeite-(YCe)Na2Ba2YCe(CO3)6 · 3H2OTric. 1 : P1
5.CC.10Tengerite-(Y)Y2(CO3)3 · 2-3H2OOrth. mmm(2/m2/m2/m) : Pnnm
5.CC.15Lokkaite-(Y)Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2OOrth.
5.CC.15Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2OOrth.
5.CC.15Hizenite-(Y)Ca2Y6(CO3)11 · 14H2O Orth.
5.CC.20Shomiokite-(Y)Na3Y[CO3]3 · 3H2OOrth. mm2
5.CC.25Lanthanite-(Ce)Ce2(CO3)3 · 8H2OOrth. mmm(2/m2/m2/m)
5.CC.25Lanthanite-(La)La2(CO3)3 · 8H2OOrth. mmm(2/m2/m2/m)
5.CC.25Lanthanite-(Nd)Nd2(CO3)3 · 8H2OOrth. mmm(2/m2/m2/m)
5.CC.25Calkinsite-(Ce)(Ce,La)2(CO3)3 · 4H2OOrth.
5.CC.30Adamsite-(Y)NaY[CO3]2 · 6H2OTric. 1 : P1
5.CC.35Decrespignyite-(Y)Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2OMon.
5.CC.40Galgenbergite-(Ce)Ca(Ce,La,Nd)2(CO3)4 · H2OTric. 1 : P1
5.CC.45Lecoqite-(Y)Na3Y(CO3)3 · 6H2OHex. 6 : P63

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 Unnamed (MSH UK-37A)Hide

References for Unnamed (MSH UK-37A)Hide

Localities for Unnamed (MSH UK-37A)Hide

Showing 1 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.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
A. Steed (pers. comm.)
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