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 % Na₂O

Yttrium 42.36 % Y 53.79 % Y₂O₃

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., QuÃ©bec, 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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Horvathite-(Y)}= 53.56 barns/electron
U=PE_{Horvathite-(Y)} x rElectron 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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Print or Cut-and-Paste your Horvathite-(Y) Specimen Label here :

Horvathite-(Y)

NaY(CO3)F2
Dana No: 16a.01.10.01 Strunz No: 05.BD.25
Locality:

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