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Horváthite-(Y)

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Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© 2005 DM

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Formula:
NaY(CO
 
3
)F
 
2
System:OrthorhombicLustre:Vitreous
Hardness:4
Name:
For Elsa (1947-) and László (1937-) Horváth, husband-and-wife team dedicated to the collection, study, and documantation of the minerals from Mont Saint-Hilaire.
This page provides mineralogical data about Horváthite-(Y).

Classification of Horváthite-(Y)

IMA status:Approved 1996
Strunz 8th edition ID:5/C.07-62
Nickel-Strunz 10th (pending) edition ID:5.BD.25

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
D : With rare earth elements (REE)
Dana 7th edition ID:16.1.11.1
Dana 8th edition ID:16a.3.11.2

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
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Type Occurrence of Horváthite-(Y)

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
Geological Setting of type material:From a pegmatite dike

Physical Properties of Horváthite-(Y)

Lustre:Vitreous
Hardness (Mohs):4
Cleavage:Very Good
[100] Very Good, [010] Good
Fracture:Irregular/Uneven
Density (measured):3.58 g/cm3
Density (calculated):3.46 g/cm3

Crystallography of Horváthite-(Y)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pmmn {P21/m 21/m 2/n}
Cell Parameters:a = 6.964Å, b = 9.173Å, c = 6.302Å
Ratio:a:b:c = 0.759 : 1 : 0.687
Unit Cell Volume:V 402.58 ų
Z:4

Optical Data of Horváthite-(Y)

Type:Biaxial (-)
RI values: nα = 1.457 nβ = 1.543 nγ = 1.622
2V:Measured: 82° , Calculated: 82°
Maximum Birefringence:δ = 0.165

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 Horváthite-(Y)

Formula:
NaY(CO
 
3
)F
 
2
Essential elements:C, F, Na, O, Y
All elements listed in formula:C, F, Na, O, Y

Relationship of Horváthite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.BD.05Cordylite-(Ce)
NaBaCe
 
2
(CO
 
3
)
 
4
F
5.BD.05Lukechangite-(Ce)
Na
 
3
Ce
 
2
(CO
 
3
)
 
4
F
5.BD.10Zhonghuacerite-(Ce)
Ba
 
2
Ce(CO
 
3
)
 
3
F
5.BD.10Kukharenkoite-(Ce)
Ba
 
2
Ce(CO
 
3
)
 
3
F
5.BD.10Kukharenkoite-(La)
Ba
 
2
(La,Ce,Th)(CO
 
3
)
 
3
F
5.BD.15Cebaite-(Ce)
Ba
 
3
Ce
 
2
(CO
 
3
)
 
5
F
 
2
5.BD.15Cebaite-(Nd)
Ba
 
3
(Nd,Ce)
 
2
(CO
 
3
)
 
5
F
 
2
5.BD.18Arisite-(Ce)
NaCe
 
2
(CO
 
3
)
 
3-x
F
 
2x+1
5.BD.18Arisite-(La)
NaLa
 
2
(CO
 
3
)
 
3-x
F
 
2x+1
5.BD.20aBastnäsite-(Ce)
(Ce,La)(CO
 
3
)F
5.BD.20aBastnäsite-(La)
(La,Ce)(CO
 
3
)F
5.BD.20aBastnäsite-(Y)
(Y,Ce)(CO
 
3
)F
5.BD.20aHydroxylbastnäsite-(Ce)
(Ce,La)(CO
 
3
)(OH,F)
5.BD.20aHydroxylbastnäsite-(Nd)
(Nd,Ce,La)(CO
 
3
)(OH,F)
5.BD.20aHydroxylbastnäsite-(La)
(La,Nd,Ce)(CO
 
3
)(OH,F)
5.BD.20bParisite-(Ce)
Ca(Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
5.BD.20bParisite-(Nd)
Ca(Nd,Ce,La)
 
2
(CO
 
3
)
 
3
F
 
2
5.BD.20dRöntgenite-(Ce)
Ca
 
2
(Ce,La)
 
3
(CO
 
3
)
 
5
F
 
3
5.BD.20cSynchysite-(Ce)
Ca(Ce,La)(CO
 
3
)
 
2
F
5.BD.20cSynchysite-(Nd)
Ca(Nd,Y,Gd)(CO
 
3
)
 
2
F
5.BD.20cSynchysite-(Y)
Ca(Y,Ce)(CO
 
3
)
 
2
F
5.BD.20aThorbastnäsite
Th(Ca,Ce)(CO
 
3
)
 
2
F
 
2
 · 3H
 
2
O
5.BD.20aBastnäsite-(Nd)
Nd(CO
 
3
)F
5.BD.25Qaqarssukite-(Ce)
Ba(Ce,REE)(CO
 
3
)
 
2
F
5.BD.35Huanghoite-(Ce)
BaCe(CO
 
3
)
 
2
F

Other Names for Horváthite-(Y)

Synonyms:
IMA1996-032
Other Languages:
Russian:Хорватит-(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 Horváthite-(Y)

Reference List:

- +
GRICE, J.D., and CHAO, G.Y. (1997) Horváthite-(Y), rare-earth-fluorocarbonate, a new mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist, 35, 743-749.

Internet Links for Horváthite-(Y)

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Horváthite-(Y) details from Handbook of Mineralogy (PDF)
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    • Localities for Horváthite-(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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    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		Grice, J.D. and Chao, G.Y. (1997), Horváthite-(Y), rare earth fluorocarbonate, a new mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist, 35, 743-750.
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