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Monteregianite-(Y)

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Big Photo

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© Stephan Wolfsried

Show Monteregianite-(Y) Photos (36)



Formula:
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
 · 10H
 
2
O
System:MonoclinicHardness:3½
Name:After the type locality at the Poudrette Quarry, Mont Saint-Hilaire (one of the Monteregian Hills), Rouville Co., Québec, Canada.


Monteregianite-(Y)-Wickenburgite Series.

Several synthetic REE analogues have been prepared.

Classification of Monteregianite-(Y)

IMA status:Approved
Strunz 8th edition ID:8/H.38-10
Nickel-Strunz 10th (pending) edition ID:9.EB.15

9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
Dana 8th edition ID:72.5.1.2

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
Hey's CIM Ref.:14.8.7

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
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Type Occurrence of Monteregianite-(Y)

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada

Physical Properties of Monteregianite-(Y)

Hardness (Mohs):3½

Crystallography of Monteregianite-(Y)

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 9.512(2) Å, b = 23.956(4) Å, c = 9.617(2) Å
β = 93.85(1)°
Ratio:a:b:c = 0.397 : 1 : 0.401
Unit Cell Volume:V 2,186.48 ų (Calculated from Unit Cell)
Z:2
Comment:Space group P21/n.

Optical Data of Monteregianite-(Y)

Type:Biaxial (+)
RI values: nα = 1.510 nβ = 1.513 nγ = 1.517
Maximum Birefringence:δ = 0.007

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Monteregianite-(Y)

Formula:
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
 · 10H
 
2
O
Essential elements:H, Na, O, Si, Y
All elements listed in formula:Ca, H, K, Na, O, Si, Y

Relationship of Monteregianite-(Y) to other Species

Series:Forms a series with Wickenburgite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.EB.05Macdonaldite
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
 · 10H
 
2
O
9.EB.05Rhodesite
KHCa
 
2
Si
 
8
O
 
19
 · 5H
 
2
O
9.EB.10Delhayelite
(Na,K)
 
10
Ca
 
5
Al
 
6
Si
 
32
O
 
80
(Cl
 
2
,F
 
2
,SO
 
4
)
 
3
 · 18H
 
2
O
9.EB.10Hydrodelhayelite
KCa
 
2
AlSi
 
7
O
 
17
(OH)
 
2
 · 6H
 
2
O
9.EB.20Carletonite
KNa
 
4
Ca
 
4
Si
 
8
O
 
18
(CO
 
3
)
 
4
(OH,F) · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.8.1Thalénite-(Y)
Y
 
3
(Si
 
3
O
 
10
)(OH)
14.8.2Keiviite-(Y)
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
14.8.3Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
14.8.4Tombarthite-(Y)
Y
 
4
(Si,H
 
4
)
 
4
O
 
12-x
(OH)
 
4+2x
14.8.5Thortveitite
(Sc,Y)
 
2
Si
 
2
O
 
7
14.8.6Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
14.8.8Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
14.8.9Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
 · 8H
 
2
O
14.8.10Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.11Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.12Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
14.8.13Cerite-(Ce)
(Ce,Ca)
 
9
(Mg,Fe)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
14.8.14Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)

Other Names for Monteregianite-(Y)

Synonyms:
IMA1972-026Montregianite-(Y)Unnamed (MSH UK-6)
Other Languages:
Russian:Монтереджианит-(Y)

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 Monteregianite-(Y)

Reference List:

- +
Chao, G.Y. (1978): Monteregianite, a new hydrous sodium potassium yttrium silicate mineral from Mont St-Hilaire, Québec. Can. Mineral., 16, 561-565.
Ghose, S., P.K. Sen Gupta, and C.F. Campana (1987): Symmetry and crystal structure of montregianite [sic], Na4K2Y2Si16O38²10H2O; a double-sheet silicate with zeolitic properties. Amer. Mineral., 72, 365-374.
Mandarino, J.A. and V. Anderson (1989): Monteregian Treasures. Cambridge Univ. Press, 144-145.
HORVÁTH, L., and GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284 359.

Internet Links for Monteregianite-(Y)

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    • Localities for Monteregianite-(Y)

    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.
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    (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
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		Chao G.Y. (1978), Monteregianite, a new hydrous sodium potassium yttrium silicate mineral from Mont St-Hilaire, Quebec. Canadian Mineralogist: 16: 561-565. HORVÁTH, L., and GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284 359.
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