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Horváthite-(Y)
A valid IMA mineral species
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About Horváthite-(Y)
László & Elsa Horváth
Formula:
NaY(CO3)F2
Colour:
Colorless to pale beige
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.58
Crystal System:
Orthorhombic
Name:
Named in 1997 by Joel D. Grice and George Y. Chao in honor of Elsa [1947-] and László [July 31, 1937-] Horváth, husband-and-wife team dedicated to the collection, study, and documentation of the minerals from Mont Saint-Hilaire. The suffix/modifier follows the Levinson rule, indicating that the predominant essential REE is yttrium.
This page provides mineralogical data about Horváthite-(Y).
Name Encoding
ASCII-7:
Horvathite-(Y)
Unique Identifiers
Mindat ID:
6999
Long-form identifier:
mindat:1:1:6999:7
IMA Classification of Horváthite-(Y)
Classification of Horváthite-(Y)
5.BD.25
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
D : With rare earth elements (REE)
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
D : With rare earth elements (REE)
Dana 7th ed.:
16.1.11.1
16a.3.11.2
16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
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 for Standard |
|---|---|---|
| Hrv-Y | 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 Horváthite-(Y)
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless to pale beige
Streak:
White
Hardness:
4 on Mohs scale
Cleavage:
Very Good
{100} very good, {010} good
{100} very good, {010} good
Fracture:
Irregular/Uneven
Density:
3.58 g/cm3 (Measured) 3.46 g/cm3 (Calculated)
Comment:
Type description gives Dcalc as 3.61.
Optical Data of Horváthite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.457(1) nβ = 1.543(1) nγ = 1.622(1)
2V:
Measured: 82° (1), Calculated: 83°
Max. Birefringence:
δ = 0.165
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
None to Very Low
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
None
Optical Extinction:
Y = a, X = b, Z = c.
Pleochroism:
Weak
Comments:
Y ≈ Z = pale brown, X = colorless.
Chemistry of Horváthite-(Y)
Mindat Formula:
NaY(CO3)F2
Element Weights:
Crystallography of Horváthite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pmmn
Cell Parameters:
a = 6.964 Å, b = 9.173 Å, c = 6.302 Å
Ratio:
a:b:c = 0.759 : 1 : 0.687
Unit Cell V:
402.58 ų
Z:
4
Morphology:
Plates; prismatic crystals elongated on [010]. Aggregates are commonly "wagon-wheel" or cylindrical in habit. Forms include {100} > {001} > {010} and minor {110}, {011} and {101}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.19 Å | (90) |
| 3.477 Å | (100) |
| 2.800 Å | (50) |
| 2.087 Å | (50) |
| 2.057 Å | (50) |
| 1.966 Å | (50) |
| 1.849 Å | (50) |
| 1.763 Å | (50) |
Type Occurrence of Horváthite-(Y)
General Appearance of Type Material:
Two distinct habits: 1) Stacks of plates, measuring approximately 1 x 1 X 0.25 mm and 2) as blocky aggregates of radiating crystals 1-5 mm across with individual, striated prismatic crystals up to 1 mm long.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, 81536.
Geological Setting of Type Material:
From an altered section of pegmatite dike in a nepheline syenite intrusive unit.
Associated Minerals at Type Locality:
Synonyms of Horváthite-(Y)
Other Language Names for Horváthite-(Y)
Common Associates
Associations Based on Photo Data:
| 11 photos of Horváthite-(Y) associated with Analcime | Na(AlSi2O6) · H2O |
| 10 photos of Horváthite-(Y) associated with Siderite | FeCO3 |
| 9 photos of Horváthite-(Y) associated with Calcite | CaCO3 |
| 6 photos of Horváthite-(Y) associated with Chabazite-Na | (Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O |
| 5 photos of Horváthite-(Y) associated with Calcite Group | ACO3 |
| 3 photos of Horváthite-(Y) associated with Albite | Na(AlSi3O8) |
| 3 photos of Horváthite-(Y) associated with Sabinaite | Na4Zr2TiO4(CO3)4 |
| 2 photos of Horváthite-(Y) associated with Leifite | (Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2 |
| 1 photo of Horváthite-(Y) associated with Polylithionite | KLi2Al(Si4O10)(F,OH)2 |
| 1 photo of Horváthite-(Y) associated with Fluorite | CaF2 |
Related Minerals - Strunz-mindat Grouping
| 5.BD. | Cordylite-(La) | (Na,Ca)Ba(La,Ce,Sr)2(CO3)4F |
| 5.BD.05 | Cordylite-(Ce) | NaBaCe2(CO3)4F |
| 5.BD.05 | 'Unnamed (Cordylite-like Calcium-Barium-Cerium Carbonate-Fluoride)' | Ca◻Ba2Ce4[CO3]8F2 |
| 5.BD.05 | Lukechangite-(Ce) | Na3Ce2(CO3)4F |
| 5.BD.10 | 'Zhonghuacerite-(Ce)' | Ba2Ce(CO3)3F |
| 5.BD.10 | Kukharenkoite-(Ce) | Ba2Ce(CO3)3F |
| 5.BD.10 | Kukharenkoite-(La) | Ba2(La,Ce,Th)(CO3)3F |
| 5.BD.15 | Cebaite-(Ce) | Ba3Ce2(CO3)5F2 |
| 5.BD.15 | 'Cebaite-(Nd)' | Ba3(Nd,Ce)2(CO3)5F2 |
| 5.BD.18 | Arisite-(Ce) | NaCe2(CO3)2[F2x(CO3)1-x]F |
| 5.BD.18 | Arisite-(La) | NaLa2(CO3)2[F2x(CO3)1-x]F |
| 5.BD.20c | Synchysite-(Ce) | CaCe(CO3)2F |
| 5.BD.20c | Synchysite-(Nd) | CaNd(CO3)2F |
| 5.BD.20c | Synchysite-(Y) | CaY(CO3)2F |
| 5.BD.20a | Bastnäsite-(Ce) | Ce(CO3)F |
| 5.BD.20b | Parisite-(Ce) | CaCe2(CO3)3F2 |
| 5.BD.20a | Bastnäsite-(La) | La(CO3)F |
| 5.BD.20b | Parisite-(Nd) | Ca(Nd,Ce,La)2(CO3)3F2 |
| 5.BD.20a | Bastnäsite-(Y) | Y(CO3)F |
| 5.BD.20b | Parisite-(La) | CaLa2(CO3)3F2 |
| 5.BD.20d | Röntgenite-(Ce) | Ca2(Ce,La)3(CO3)5F3 |
| 5.BD.20a | Thorbastnäsite | ThCa(CO3)2F2 · 3H2O |
| 5.BD.20a | Hydroxylbastnäsite-(Ce) | Ce(CO3)(OH) |
| 5.BD.20a | Hydroxylbastnäsite-(Nd) | Nd(CO3)(OH) |
| 5.BD.20c | 'Hydroxylsynchysite-(Ce)' | Ca(Ce,La)(CO3)2(OH) |
| 5.BD.20c | 'Synchysite-(La)' | Ca(La,Nd)(CO3)2F |
| 5.BD.20a | Bastnäsite-(Nd) | Nd(CO3)F |
| 5.BD.20a | Hydroxylbastnäsite-(La) | (La,Nd,Ce)(CO3)(OH,F) |
| 5.BD.25 | Qaqarssukite-(Ce) | Ba(Ce,REE)(CO3)2F |
| 5.BD.35 | Huanghoite-(Ce) | BaCe(CO3)2F |
| 5.BD.35 | Huanghoite-(Nd) | BaNd(CO3)2F |
| 5.BD.45 | Bayanoboite-(Y) | Ba2Y(CO3)2F3 |
Other Information
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 Horváthite-(Y)
mindat.org URL:
https://www.mindat.org/min-6999.html
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References for Horváthite-(Y)
Localities for Horváthite-(Y)
Showing 2 localities.
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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) | |
| Grice et al. (1997) +1 other reference |
| confirmed by XRD July 2017. +1 other reference |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada