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Montroyalite

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Francon quarry, Montréal, Québec, Canada
© 2008, JGW

Formula:
Sr
 
4
Al
 
8
[(OH,F)
 
26
|(CO
 
3
)
 
3
] · 10-11H
 
2
O
Hardness:3½
This page provides mineralogical data about Montroyalite.

Classification of Montroyalite

IMA status:Approved 1985
Strunz 8th edition ID:5/E.08-80
Nickel-Strunz 10th (pending) edition ID:5.DB.10

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
Dana 8th edition ID:16b.5.3.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : AmBn(XO3)pZqxH2O & with (m+n):p = 4:1
Hey's CIM Ref.:11.7.11

11 : Carbonates
7 : Carbonates of Al
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Type Occurrence of Montroyalite

Type Locality:Francon quarry, Montréal, Québec, Canada
Year of Discovery:1986

Physical Properties of Montroyalite

Hardness (Mohs):3½

Optical Data of Montroyalite

Type:Biaxial (-)
RI values: nα = 1.515 nβ = 1.530 nγ = 1.545
2V:Measured: 80° to 89°, Calculated: 88°
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:relatively weak

Chemical Properties of Montroyalite

Formula:
Sr
 
4
Al
 
8
[(OH,F)
 
26
|(CO
 
3
)
 
3
] · 10-11H
 
2
O
Essential elements:Al, C, H, O, Sr
All elements listed in formula:Al, C, F, H, O, Sr

Relationship of Montroyalite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DB.05Alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
·3H
 
2
O
5.DB.05Nasledovite
PbMn
 
3
Al
 
4
(CO
 
3
)
 
4
SO
 
4
O
 
5
·5H
 
2
O
5.DB.05Para-alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
·6H
 
2
O
5.DB.05UM1977-02-CO:AlCaH
Ca
 
3
Al
 
2
O
 
6
(CO
 
3
)
 
3
·32H
 
2
O
5.DB.10Dresserite
BaAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
5.DB.10Dundasite
PbAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
5.DB.10Strontiodresserite
(Sr,Ca)Al
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
5.DB.10Petterdite
PbCr
3+
2
(CO
 
3
)
 
2
(OH)
 
4
·H
 
2
O
5.DB.10Kochsándorite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
5.DB.15Hydrodresserite
BaAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · 3H
 
2
O
5.DB.20Schuilingite-(Nd)
PbCu(Nd,Gd,Sm,Y)(CO
 
3
)
 
3
(OH)·1.5H
 
2
O
5.DB.25Sergeevite
Ca
 
2
Mg
 
11
(CO
 
3
)
 
13
·10H
 
2
O
5.DB.30Szymańskiite
Hg
 
16
(Ni,Mg)
 
6
(CO
 
3
)
 
12
(OH)
 
12
(H
 
3
O)
 
8
·3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
11.7.1Scarbroite
Al
 
5
(OH)
 
13
CO
 
3
·5H
 
2
O
11.7.2Hydroscarbroite
Al
 
14
(CO
 
3
)
 
3
(OH)
 
36
·nH
 
2
O
11.7.3Dawsonite
NaAlCO
 
3
(OH)
 
2
11.7.4Hydrotalcite
Mg
 
6
Al
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
11.7.5Manasseite
Mg
 
6
Al
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
11.7.6Indigirite
Mg
 
2
Al
 
2
[(CO
 
3
)
 
4
(OH)
 
2
] · 15H
 
2
O
11.7.7Alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
·3H
 
2
O
11.7.8Para-alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
·6H
 
2
O
11.7.9Tunisite
NaCa
 
2
Al
 
4
(CO
 
3
)
 
4
(OH)
 
8
Cl
11.7.10Wermlandite
Mg
 
7
(Ca,Mg)(Al,Fe)
 
2
(SO
 
4
)
 
2
(OH)
 
18
(H
 
2
O)
 
12
11.7.12Dresserite
BaAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
11.7.13Hydrodresserite
BaAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · 3H
 
2
O
11.7.14Strontiodresserite
(Sr,Ca)Al
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O

Other Names for Montroyalite

Synonyms:
IMA1985-001
Other Languages:
German:Montroyalit
Spanish:Montroyalita

Other Information

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

References for Montroyalite

Reference List:Canadian Mineralogist (1986): 24: 455-459.

American Mineralogist (1987): 72: 1025.

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    Localities for Montroyalite

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    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Montréal
    		Canadian Mineralogist (1986): 24, 455-459.
    Mineral and/or Locality
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