Hilairite Mineral Data

General Hilairite Information

Chemical Formula:

Na2ZrSi3O9•3(H2O)

Composition:

Molecular Weight = 419.50 gm

Sodium 10.96 % Na 14.77 % Na₂O

Zirconium 21.75 % Zr 29.37 % ZrO₂

Silicon 20.08 % Si 42.97 % SiO₂

Hydrogen 1.44 % H 12.88 % H₂O

Oxygen 45.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂ZrSi₃O₉•3(H₂O)

Environment:

In miarolitic cavities and altered pegmatite dikes in nepheline syenite in an intrusive alkalic gabbro-syenite complex

IMA Status:

Approved IMA 1974

Locality:

Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Hilairite + Pronunciation

Synonym:

IMA1972-019

Hilairite Image

Images:

Hilairite

Comments: Brown-yellow hilairite grains with white, prismatic natrolite crystals.
Location: Malerod, Larvik, Norway. Scale: See Box (2 x 2 cm).
© Sonke Stolze / Systematic Minerals

Hilairite Crystallography

Axial Ratios:

a:c = 1:1.50161

Cell Dimensions:

a = 10.556, c = 15.851, Z = 6; V = 1,529.63 Den(Calc)= 2.73

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 5.28(1), 6(0.6), 3.17(0.5),

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Physical Properties of Hilairite

Cleavage:

None

Color:

Light brown.

Density:

2.72

Diaphaneity:

Transparent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hilairite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2207,KPDmeas= 0.2215,KC= 0.2232
Ncalc = 1.61

Optical Data:

Uniaxial (-), e=1.596, w=1.609, bire=0.0130.

Calculated Properties of Hilairite

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Hilairite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Hilairite= 29.45 barns/electron
U=PE_Hilairite x rElectron Density= 78.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hilairite is Not Radioactive

Hilairite Classification

Dana Class:

59.02.03.01 (59)Cyclosilicate Three-Membered Rings

(59.02)hydrated

(59.02.03)Hilairite group

59.02.03.01 Hilairite Na2ZrSi3O9•3(H2O) R 3m 3 2/m

59.02.03.02 Calciohilairite CaZrSi3O9•3(H2O) R 32 3 2

59.02.03.03 Sazykinaite-(Y) Na5YZrSi6018•6(H2O) R 32 3 2

59.02.03.04 Pyatenkoite-(Y)! Na5(Y,Dy,Gd)TiSi6O18•6(H2O) R 32 3 2

Strunz Class:

09.DM.10 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DM -Inosilicates with 6-periodic single chains

09.DM.10 Calciohilairite CaZrSi3O9•3(H2O) R 32 3 2

09.DM.10 Hilairite Na2ZrSi3O9•3(H2O) R 3m 3 2/m

09.DM.10 Komkovite BaZrSi3O9•3(H2O) R 32 3 2

09.DM.10 Pyatenkoite-(Y)! Na5(Y,Dy,Gd)TiSi6O18•6(H2O) R 32 3 2

09.DM.10 Sazykinaite-(Y) Na5YZrSi6018•6(H2O) R 32 3 2

Other Hilairite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Hilairite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Hilairite Specimen Label here :

Hilairite

Na2ZrSi3O9•3(H2O)
Dana No: 59.02.03.01 Strunz No: 09.DM.10
Locality:

Notes:

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