Parakeldyshite (original) (raw)
A valid IMA mineral species
About ParakeldyshiteHide
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Specific Gravity:
3.37 - 3.39
Name:
Named for its chemical relationship to keldyshite.
This page provides mineralogical data about Parakeldyshite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3094:2
3a05b080-b06f-4448-bcdc-edf3b65b2d6e
IMA Classification of ParakeldyshiteHide
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Type description reference:
Classification of ParakeldyshiteHide
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9.BC.10
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
55.2.2.3
55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
14.10.4
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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 |
|---|---|---|
| Pkel | 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 ParakeldyshiteHide
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Cleavage:
Perfect
Three cleavages result in a pseudo-rhombohedral shape: {001} perfect, {110} and {110} somewhat less perfect. The acute angles between these planes are all between 76° and 82°. Also a good cleavage parallel to {011}.
Density:
3.37 - 3.39 g/cm3 (Measured) 3.40 g/cm3 (Calculated)
Optical Data of ParakeldyshiteHide
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RI values:
_n_α = 1.670 _n_β = 1.692 - 1.697 _n_γ = 1.713 - 1.718
2V:
Measured: 83° to 84°, Calculated: 88°
δ = 0.043 - 0.048
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
Y ≈ c; X ≈ b; Z ≈ a.
Chemistry of ParakeldyshiteHide
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Mindat Formula:
Na2ZrSi2O7
Common Impurities:
Ti,Hf,Al,Fe,Mg,Ca,K,H2O
Crystallography of ParakeldyshiteHide
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Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 5.419(1) Å, b = 6.607(2) Å, c = 8.806(2) Å
α = 71.50(2)°, β = 87.15(3)°, γ = 85.63(2)°
Ratio:
a:b:c = 0.82 : 1 : 1.333
Unit Cell V:
298.01 ų (Calculated from Unit Cell)
Twinning:
Polysynthetic on {100}, with several other sets intersecting.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0018674 | Parakeldyshite | Pekov I V, Zubkova N V, Pushcharovsky D Y, Kolitsch U, Tillmanns E (2007) Refined crystal structure of parakeldyshite and genetic crystal chemistry of zirconium minerals with [Si2O7] diorthogroups Crystallography Reports 52 1066-1071 | 2007 | Alluaiv Mountain (Lovozero), Kola Peninsula, Russia | 0 | 293 | |
| 0014056 | Parakeldyshite | Voronkov A A, Shumyatskaya N G, Pyatenko Y A (1970) Crystal structure of a new natural modification of Na2Zr[Si2O7] Journal of Structural Chemistry 11 866-867 | 1970 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.963 Å | (10) |
| 2.913 Å | (9) |
| 4.234 Å | (7) |
| 2.703 Å | (7) |
| 6.00 Å | (6) |
| 2.718 Å | (6) |
| 2.905 Å | (5) |
Comments:
Bratthagen, Norway. Data from Raade and Mladeck (1977).
Geological EnvironmentHide
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Type Occurrence of ParakeldyshiteHide
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General Appearance of Type Material:
Grains to 5 mm and aggregates.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, 3270, 4457; Mining Institute, St. Petersburg, 1079/1{2, vis4361; Vernadsky Geological Museum, Moscow, 517151; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 78461, 78462
Associated Minerals at Type Locality:
Reference:
Sizova R G, Kuz'min E A, Ilyukhin V V (1975) Deciphering the continuous Patterson function of the Na,Zr-diorthosilicate Na2ZrSi2O7 (parakeldyshite) by the vector subsystem method. Konstitutsiya i Svoistva Mineralov 9, 10-12
Synonyms of ParakeldyshiteHide
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Other Language Names for ParakeldyshiteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of ParakeldyshiteHide
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Fluoresces deep cream under SW UV and a very weak cream under LW UV.
Other InformationHide
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Special Storage/
Display Requirements:
Alters readily to a snow-white coating.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for ParakeldyshiteHide
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References for ParakeldyshiteHide
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Reference List:
Localities for ParakeldyshiteHide
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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.