Horvathite-(Y) Mineral Data
General Horvathite-(Y) Information
Chemical Formula:
NaY(CO3)F2
Composition:
Molecular Weight = 209.90 gm
Sodium 10.95 % Na 14.76 % Na2 O
Yttrium 42.36 % Y 53.79 % Y2 O3
Carbon 5.72 % C 20.97 % CO2
Oxygen 22.87 % O
Fluorine 18.10 % F 18.10 % F
- %
F -7.62 % -O=F2
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
NaY(CO3 )F2
Environment:
In a large pegmatite dike.
IMA Status:
Approved IMA 1996 (Dana # Added)
Locality:
Poudrette Quarry, Mont Saint-Hillaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:
For Elsa (1947-) and Laszlo (1937-) Horvath, husband-and-wife team dedicated to the collection, study, and documentation of the minerals from Mont Saint-Hilaire.
Name Pronunciation:
Horvathite-(Y) + Pronunciation
Synonym:
ICSD 76857
IMA1996-032
Horvathite-(Y) Image
Images:
Horvathite-(Y)
Comments: Blocky crystals of horvathite-(Y) in matrix.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada.
Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag
Horvathite-(Y) Crystallography
Axial Ratios:
a:b:c =0.7591:1:0.687
Cell Dimensions:
a = 6.964, b = 9.173, c = 6.302, Z = 4; V = 402.58 Den(Calc)= 3.46
Crystal System:
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
X Ray Diffraction:
By Intensity(I/Io ): 3.477(1), 5.19(0.9), 2.8(0.5),
Physical Properties of Horvathite-(Y)
Cleavage:
{100} Very Good, {010} Good
Color:
Colorless, Pale yellow, Pale beige.
Density:
3.58
Diaphaneity:
Transparent to translucent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Horvathite-(Y)
Optical Data:
Biaxial (-), a=1.457, b=1.543, g=1.622, bire=0.1650, 2V(Calc)=82, 2V(Meas)=82. Dispersion none.
Calculated Properties of Horvathite-(Y)
Electron Density:
Bulk Density (Electron Density)=3.23 gm/cc note: Specific Gravity of Horvathite-(Y) =3.46 gm/cc.
Fermion Index:
Fermion Index = 0.0007392041 Boson Index = 0.9992607959
Photoelectric:
PEHorvathite-(Y) = 53.56 barns/electronU=PEHorvathite-(Y) x r Electron Density= 173.06 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Horvathite-(Y) is Not Radioactive
Horvathite-(Y) Classification
Dana Class:
16a.01.10.01 (16a) Carbonates - Hydroxyl or Halogen
(16a.01) in the Bastnasite/Shynchysite/Parasite Groups
(16a.01.10) Dana Group
16a.01.10.01 Horvathite-(Y) ! NaY(CO3)F2 Pmcn 2/m 2/m 2/m
Strunz Class:
05.BD.25 05 - CARBONATES (NITRATES)
05.B - Carbonates with additional anions, without H2O
05.BD -With rare-earth elements (REE)
05.BD.25 Horvathite-(Y) ! NaY(CO3)F2 Pmcn 2/m 2/m 2/m
Other Horvathite-(Y) Information
References:
NAME( MinRec) PHYS. PROP.(Min.Mag.,Vol.61,p733,1997) OPTIC PROP.(MinRec)
See Also:
Links to other databases for Horvathite-(Y) :
1 - Alkali-Nuts(Francais)
2 - Am. Min. Crystal Structure Database
3 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST
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Horvathite-(Y)
NaY(CO3)F2
Dana No: 16a.01.10.01 Strunz No: 05.BD.25
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