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|Name:||In allusion to its composition, being a silicate of HAFNium, and ending in "ON" in allusion to, and to be consistent with, its relationship to ZircON.|
Classification of Hafnon
|Strunz 8th edition ID:||8/A.09-20|
|Nickel-Strunz 10th (pending) edition ID:||9.AD.30|
9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in  and/or greater coordination
|Dana 8th edition ID:||22.214.171.124|
51 : NESOSILICATES Insular SiO4 Groups Only
5 : Insular SiO4 Groups Only with cations in > coordination
|Hey's CIM Ref.:||14.10.2|
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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Type Occurrence of Hafnon
|Co-type Localities:||Moneia Mine, Alto Ligonha District, Zambezia Province, Mozambique|
Morro Conco mine, Alto Ligonha District, Zambezia Province, Mozambique
Muiâne pegmatite, Alto Ligonha District, Zambezia Province, Mozambique
|Year of Discovery:||1974|
|Geological Setting of type material:||Tantalum-bearing granitic pegmatites.|
|Associated Minerals at type locality:|
Physical Properties of Hafnon
|Diaphaneity (Transparency):||Transparent, Translucent|
|Colour:||Red-orange, brown-yellow, colourless (rare)|
Crystallography of Hafnon
|Class (H-M):||4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal|
|Cell Parameters:||a = 6.57Å, c = 5.96Å|
|Ratio:||a:c = 1 : 0.907|
|Unit Cell Volume:||V 257.26 Å³ (Calculated from Unit Cell)|
|Morphology:||Crystals euhedral to irregular. Often zoned with zircon.|
Optical Data of Hafnon
|RI values:||nω = 1.930 - 1.970 nε = 1.980 - 2.030|
|Maximum Birefringence:||δ = 0.050|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
Chemical Properties of Hafnon
|Simplified for copy/paste:||HfSiO4|
|Essential elements:||Hf, O, Si|
|All elements listed in formula:||Hf, O, Si|
Relationship of Hafnon to other Species
|Series:||Forms a series with Zircon (see here)|
|Member of:||Zircon Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Hafnon
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Hafnon
Salt, D.J. and Hornung, G. (1967) Synthesis and X-ray study of hafnium silicate. Journal of the American Ceramic Society: 50: 549-550.
Correia Neves, J.M., Lopes Nunes, J.E., and Sahama, T.G. (1974) High hafnium members of nthe zircon-hafnon series from the granite pegmatites of Zambézia, Mozambique. Contributions to Mineralogy and Petrology: 48: 73-80.
American Mineralogist (1976): 61: 175 (abstract).
Speer, J.A. and B.J. Cooper (1982) Crystal structure of synthetic hafnon, HfSiO4, comparison with zircon and the actinide orthosilicates. American Mineralogist: 67: 804-808.
Internet Links for Hafnon
Localities for Hafnon
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Monte Suímo Mine, Belas, Sintra, Lisbon District, PortugalFrom Rui Nunes, 21st Dec 2014 19:03:10