Hilairite Mineral Data

Hilairite Mineral Data +

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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)

IMA Status:

Approved IMA 1974

Locality:

Link to MinDat.org Location Data.

Synonym:

IMA1972-019

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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 ScalenohedralH-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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Crystal Structure:

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Ilyushin G D , Voronkov A A , Nevskii N N , Ilyukhin V V , Belov N V , Doklady Akademii Nauk SSSR , 260 (1981) p.1118-1120, Crystal structure of hilairite, Na2ZrSi3O9*3H2O

Physical Properties of Hilairite

Cleavage:

None

Color:

Light brown.

Density:

2.72

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Hilairite

Electron Density:

r_electron=2.67 gm/cc
note: r_Hilairite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.034
Boson Index = 0.966

Photoelectric:

PE_Hilairite= 29.45 barns/electron
U=PE_Hilairite x r_electron= 78.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hilairite is Not Radioactive

Hilairite Classification

Dana Class:

59.2.3.1 (59)Cyclosilicate Three-Membered Rings

(59.2)hydrated

(59.2.3)Hilairite group

59.2.3.1 Hilairite Na2ZrSi3O9·3(H2O) R 3m 3 2/m

59.2.3.2 Calciohilairite CaZrSi3O9·3(H2O) R 32 3 2

59.2.3.3 Sazykinaite-(Y) Na5YZrSi6018·6(H2O) R 32 3 2

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

Strunz Class:

VIII/F.29-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) Six chains [Si6O18]12- and six bands [Si12O30]12-

VIII/F.29 - Hilairite - Stokesite series

VIII/F.29-10 Hilairite Na2ZrSi3O9·3(H2O) R 3m 3 2/m

VIII/F.29-20 Calciohilairite CaZrSi3O9·3(H2O) R 32 3 2

VIII/F.29-24 Pyatenkoite-(Y)! Na5(Y,Dy,Gd)TiSi6O18·6(H2O) R 32 3 2

VIII/F.29-25 Sazykinaite-(Y) Na5YZrSi6018·6(H2O) R 32 3 2

VIII/F.29-30 Stokesite CaSnSi3O9·2(H2O) Pnna 2/m 2/m 2/m

Other Hilairite Information

References:

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

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Hilairite

Na2ZrSi3O9·3(H2O)
Dana No: 59.2.3.1 Strunz No: VIII/F.29-10
Locality:

Notes: