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Rigrahamite

A valid IMA mineral species - pending publication
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Unique IdentifiersHide

Mindat ID:
498737
Long-form identifier:
mindat:1:1:498737:2

IMA Classification of RigrahamiteHide

IMA status:
Approved, Pending publication

Classification of RigrahamiteHide

Strunz-mindat (2026):
5.DB.

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations

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

Chemistry of RigrahamiteHide

Mindat Formula:
Na2Ca2Th2(CO3)4(HCO3)2(OH)4(H2O)7
Element Weights:
Element% weight
Th40.481 %
O40.472 %
Ca6.992 %
C6.286 %
Na4.011 %
H1.758 %

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

Crystallography of RigrahamiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 6.3846(1) Å, b = 30.8254(4) Å, c = 6.49473(8) Å
β = 95.354(1)°
Ratio:
a:b:c = 0.207 : 1 : 0.211
Unit Cell V:
1,272.64 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.647 Å(28)
2.963 Å(100)
2.541 Å(13)
2.491 Å(15)
1.768 Å(14)
1.733 Å(18)
1.716 Å(24)
1.537 Å(14)

Type Occurrence of RigrahamiteHide

Type 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
Place of Conservation of Type Material:
Type material is deposited in the collections of the Canadian Museum of Nature, PO Box 3443, Station “D”, Ottawa, Ontario, Canada, catalogue number CMNMC 90989 (holotype), and the Natural History Museum, University of Oslo, PO Box 1172, Blindern, Oslo, Norway, catalogue number KNR 44454 (cotype)

Other Language Names for RigrahamiteHide

Related Minerals - Strunz-mindat GroupingHide

5.DB.GrguriciteCaCr2(CO3)2(OH)4 · 4H2OTric. 1 : P1
5.DB.05Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
5.DB.05NasledovitePbMn3Al4(CO3)4(SO4)O5 · 5H2O
5.DB.05'UM1977-02-CO:AlCaH'Ca6Al2(CO3)3O6 · 32H2O
5.DB.05AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2OTric. 1 : P1
5.DB.10KochsándoriteCaAl2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
5.DB.10DresseriteBaAl2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
5.DB.10DundasitePbAl2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
5.DB.10'Unnamed (Ca-analogue of Petterdite)'CaCr3+2(CO3)2(OH)4 · H2O
5.DB.10PetterditePbCr3+2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
5.DB.10StrontiodresseriteSrAl2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
5.DB.10MontroyaliteSr4Al8(CO3)3(OH,F)26 · 10-11H2OTric.
5.DB.15HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2OTric. 1 : P1
5.DB.20Schuilingite-(Nd)PbCu(Nd,Gd,Sm,Y)(CO3)3(OH) · 1.5H2OOrth. mm2
5.DB.25SergeeviteCa2Mg11(CO3)9(HCO3)4(OH)4 · 6H2OTrig.
5.DB.30Szymańskiite[H3O]+8[Hg2]2+8(Ni,Mg)6[CO3]12(OH)12 · 3H2OHex. 6 : P63
5.DB.35Lusernaite-(Y)Y4Al(CO3)2(OH)10F · 6H2O Orth. mmm (2/m 2/m 2/m) : Pnma
5.DB.40PutnisiteSrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O Orth. mmm (2/m 2/m 2/m) : Pnma

RadioactivityHide

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 RigrahamiteHide

References for RigrahamiteHide

Localities for RigrahamiteHide

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 (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Bosi et al. (2025)
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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