Montroyalite
A valid IMA mineral species
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About Montroyalite
Mont Royal, Quebec, Canada
Formula:
Sr4Al8(CO3)3(OH,F)26 · 10-11H2O
Colour:
White
Lustre:
Waxy
Hardness:
3½
Specific Gravity:
2.677
Crystal System:
Triclinic
Name:
Named by A.C. Roberts, A.P. Sabina, M. Bonardi, J.L. Jambor, R.A. Ramik, B.D. Sturman, and M.J. Carr in 1986 for Mont-Royal, which is one of the Monteregian hills and a prominant landmark in Montreal. Mont-Royal is not the type locality for the species; the Francon quarry approximately 15 km to the NE has that designation.
Type Locality:
Unique Identifiers
Mindat ID:
2770
Long-form identifier:
mindat:1:1:2770:6
GUID
(UUID V4):
(UUID V4):
76563e20-3184-498e-a812-cf6a5153e59f
IMA Classification of Montroyalite
Classification of Montroyalite
5.DB.10
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
16b.5.3.1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : AmBn(XO3)pZqxH2O & with (m+n):p = 4:1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : AmBn(XO3)pZq
11.7.11
11 : Carbonates
7 : Carbonates of Al
11 : Carbonates
7 : Carbonates of Al
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mtyl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Montroyalite
Waxy
Transparency:
Translucent
Comment:
Dull exterior of hemispheres
Colour:
White
Streak:
White
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Splintery
Density:
2.677 g/cm3 (Measured)
Optical Data of Montroyalite
Type:
Biaxial (-)
RI values:
nα = 1.515 nβ = 1.530 nγ = 1.545
2V:
Measured: 80° to 89°, Calculated: 88°
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
relatively weak
Chemistry of Montroyalite
Mindat Formula:
Sr4Al8(CO3)3(OH,F)26 · 10-11H2O
Crystallography of Montroyalite
Crystal System:
Triclinic
Comment:
Probably
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.57 Å | (100) |
| 4.00 Å | (50) |
| 3.283 Å | (55) |
| 3.190 Å | (50) |
| 2.862 Å | (40) |
| 2.551 Å | (40) |
| 2.481 Å | (40) |
| 2.356 Å | (45) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Montroyalite
General Appearance of Type Material:
Translucent white millimeter-sized hemispheres.
Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Canada, 64261–64265.
Geological Setting of Type Material:
Silicocarbonate sill
Associated Minerals at Type Locality:
Synonyms of Montroyalite
Other Language Names for Montroyalite
German:Montroyalit
Spanish:Montroyalita
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Montroyalite associated with Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O |
| 2 photos of Montroyalite associated with Halloysite | Al2(Si2O5)(OH)4 |
| 2 photos of Montroyalite associated with Kaolinite | Al2(Si2O5)(OH)4 |
| 2 photos of Montroyalite associated with UM1990-28-OHF:Al | Al(OH,F)3 |
| 2 photos of Montroyalite associated with Albite | Na(AlSi3O8) |
| 2 photos of Montroyalite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 5.DB. | Grguricite | CaCr2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Alumohydrocalcite | CaAl2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Nasledovite | PbMn3Al4(CO3)4(SO4)O5 · 5H2O |
| 5.DB.05 | Para-alumohydrocalcite | CaAl2(CO3)2(OH)4 · 6H2O |
| 5.DB.05 | UM1977-02-CO:AlCaH | Ca6Al2(CO3)3O6 · 32H2O |
| 5.DB.10 | Dresserite | BaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Dundasite | PbAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Petterdite | PbCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Kochsándorite | CaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Unnamed (Ca-analogue of Petterdite) | CaCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.15 | Hydrodresserite | BaAl2(CO3)2(OH)4 · 3H2O |
| 5.DB.20 | Schuilingite-(Nd) | PbCu(Nd,Gd,Sm,Y)(CO3)3(OH) · 1.5H2O |
| 5.DB.25 | Sergeevite | Ca2Mg11(CO3)9(HCO3)4(OH)4 · 6H2O |
| 5.DB.30 | Szymańskiite | [H3O]+8[Hg2]2+8(Ni,Mg)6[CO3]12(OH)12 · 3H2O |
| 5.DB.35 | Lusernaite-(Y) | Y4Al(CO3)2(OH)10F · 6H2O |
| 5.DB.40 | Putnisite | SrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O |
Fluorescence of Montroyalite
Fluoresces white under long and short wave UV.
Other Information
Notes:
Soluble in 1:1 HCl at room temperature.
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 Montroyalite
mindat.org URL:
https://www.mindat.org/min-2770.html
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References for Montroyalite
Reference List:
Roberts, A. C., Sabina, A. P., Bonardi, M., Jambor, J. L., Ramik, R. A., Sturman, B. D., Carr, M. J. (1986) Montroyalite, a new hydrated Sr-Al hydroxycarbonate from the Francon quarry, Montreal, Quebec. The Canadian Mineralogist, 24 (3) 455-459
Hawthorne, Frank C., Jambor, John L., Bladh, Kenneth W., Burke, Ernst A. J., Grice, Joel D., Phillips, Don, Roberts, Andrew C., Schedler, Robert A., E., James (1987) New mineral names. American Mineralogist, 72 (9-10) 1023-1028
Localities for Montroyalite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| 176-178. +3 other references |
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Francon quarry, Montréal, Québec, Canada