Hafnon Mineral Data

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General Hafnon Information

Chemical Formula:

HfSiO4

Composition:

Molecular Weight = 244.28 gm

Hafnium 58.45 % Hf 68.93 % HfO₂

Zirconium 2.24 % Zr 3.03 % ZrO₂

Silicon 13.11 % Si 28.04 % SiO₂

Oxygen 26.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Hf_0.8Zr_0.06Si_1.14O₄

Environment:

Found in tantalum-bearing granite pegmatites and in a weathered pegmatite.

IMA Status:

Approved IMA 1974

Locality:

(Zambezia district, Mozambique and Mt. Holland, Western Australia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition containing hafnium.

Name Pronunciation:

Hafnon

Synonym:

ICSD 59111

PDF 20-467

Hafnon Image

Images:

Hafnon

Comments: Colorless unconsolidated hafnon grains, sample is from Speer and Cooper (1982).
Location: Synthetic from Alex Speer. Scale: See Image.
© Rruff Database

Hafnon Crystallography

Axial Ratios:

a:c = 1:0.90729

Cell Dimensions:

a = 6.5725, c = 5.9632, Z = 4; V = 257.60 Den(Calc)= 6.30

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 3.29(1), 2.512(0.7), 4.43(0.6),

Crystal Structure:

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Speer J A , Cooper B J , American Mineralogist , 67 (1982) p.804-808, Crystal structure of synthetic hafnon, HfSiO4, comparison with zircon and the, actinide orthosilicates

Physical Properties of Hafnon

Cleavage:

{???} Indistinct

Color:

Colorless, Brownish, Yellow.

Density:

6.97

Diaphaneity:

Transparent

Hardness:

7.5 - Garnet

Luster:

Vitreous - Adamantine

Streak:

gray white

Optical Properties of Hafnon

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1552,KPDmeas= 0.1402,KC= 0.144
Ncalc = 1.91 - 2

Optical Data:

Uniaxial (+), w=1.93-1.97, e=1.98-2.03, bire=0.0500-0.0600.

Calculated Properties of Hafnon

Electron Density:

Bulk Density (Electron Density)=6.16 gm/cc
note: Specific Gravity of Hafnon =6.97 gm/cc.

Fermion Index:

Fermion Index = 0.19
Boson Index = 0.81

Photoelectric:

PE_Hafnon= 651.76 barns/electron
U=PE_Hafnon x rElectron Density=4,015.37 barns/cc.

Radioactivity:

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

Hafnon Classification

Dana Class:

51.05.02.02 (51)Nesosilicate Insular SiO4 Groups Only

(51.05)with cations in >[6] coordination

(51.05.02)Zircon group

51.05.02.01 Zircon ZrSiO4 I 4₁/amd 4/m 2/m 2/m

51.05.02.02 Hafnon HfSiO4 I 4₁/amd 4/m 2/m 2/m

51.05.02.03 Thorite ThSiO4 I 4₁/amd 4/m 2/m 2/m

51.05.02.04 Coffinite U(SiO4)1-x(OH)4x I 4₁/amd 4/m 2/m 2/m

51.05.02.05 Thorogummite Th(SiO4)1-x(OH)4x I 4₁/amd 4/m 2/m 2/m

51.05.02.06 IMA2008-035! CeSiO4 I 4₁/amd 4mm

Strunz Class:

09.AD.30 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.30 Coffinite U(SiO4)1-x(OH)4x I 4₁/amd 4/m 2/m 2/m

09.AD.30 Hafnon HfSiO4 I 4₁/amd 4/m 2/m 2/m

09.AD.30 Thorite ThSiO4 I 4₁/amd 4/m 2/m 2/m

09.AD.30 Thorogummite Th(SiO4)1-x(OH)4x I 4₁/amd 4/m 2/m 2/m

09.AD.30 Zircon ZrSiO4 I 4₁/amd 4/m 2/m 2/m

09.AD.30 IMA2008-035! CeSiO4 I 4₁/amd 4mm

Other Hafnon 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 Hafnon :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineral and Gemstone Kingdom
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - University of Colorado - Mineral Structure Data
17 - WWW-MINCRYST

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

Hafnon

HfSiO4
Dana No: 51.05.02.02 Strunz No: 09.AD.30
Locality:

Notes: