Zirkelite (original) (raw)
A valid IMA mineral species - grandfathered
About ZirkeliteHide
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Lustre:
Adamantine, Vitreous, Greasy, Sub-Metallic, Dull
Name:
Named after Ferdinand Zirkel (May 20, 1838 Bonn, Germany - June 12, 1912), Professor of Mineralogy, University of Lemberg, and later at the University of Leipzig, Germany. He was a pioneer in the microscopic investigation of rocks. Note: some sources erroneously list March as the birth month.
Black grains or masses, rarely as simple to complex isometric crystals.
Compare the chemically related zirconolite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:4425:3
3e60c0e0-2858-4dff-9500-e537426eb6ac
IMA Classification of ZirkeliteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Redefined by the IMA
IMA Formula:
(Ti,Ca,Zr)O2-x
Approval history:
Redefined 1989 s.p.: Bayliss et al. (1989).
Classification of ZirkeliteHide
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4.DL.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
L : With large (+- medium-sized) cations; fluorite-type structures
8.2.5.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
7.10.8
7 : Oxides and Hydroxides
10 : Oxides of Zr and Th
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Zke | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of ZirkeliteHide
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Adamantine, Vitreous, Greasy, Sub-Metallic, Dull
Comment:
May be brown when altered
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.741 g/cm3 (Measured)
Comment:
May be lower due to alteration
Optical Data of ZirkeliteHide
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Internal Reflections:
Reddish brown
Pleochroism:
Non-pleochroic
Comments:
Reddish brown in thin section
Chemistry of ZirkeliteHide
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Mindat Formula:
(Ti,Ca,Zr)O2-x
Crystallography of ZirkeliteHide
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Cell Parameters:
a = 5.02 Å
Unit Cell V:
126.51 ų (Calculated from Unit Cell)
Morphology:
Crystals as flattened octahedra.
Twinning:
On {111} very common, both polysynthetic and as complicated fourlings.
Comment:
Redefined in 1989 as the isometric structure of a set of related chemically minerals. Earlier definitions gave monoclinic symmetry but that material is now called zirconolite.
Crystal StructureHide
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X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.90 Å | (100) |
| 2.52 Å | (40) |
| 1.78 Å | (70) |
| 1.52 Å | (60) |
| 1.46 Å | (20) |
| 1.26 Å | (20) |
| 1.16 Å | (30) |
| 1.13 Å | (20) |
Comments:
ICDD-PDF 38-0450
Geological EnvironmentHide
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Type Occurrence of ZirkeliteHide
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General Appearance of Type Material:
Black submetallic to vitreous grains and crystals.
Other Language Names for ZirkeliteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
| 1 photo of Zirkelite associated with Brucite | Mg(OH)2 |
|---|---|
| 1 photo of Zirkelite associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of ZirkeliteHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Zirkelite in petrologyHide
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An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for ZirkeliteHide
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References for ZirkeliteHide
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Reference List:
Bulakh, A. G., Nesterov, A. R., Williams, C. T., Anisimov, I. S. (1998) Zirkelite from the Sebl'yavr carbonatite complex, Kola Peninsula, Russia: an X-ray and electron microprobe study of a partially metamict mineral. Mineralogical Magazine, 62 (6) 837-846 doi:10.1180/002646198548205
Localities for ZirkeliteHide
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This 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.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.