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Parakeldyshite

A valid IMA mineral species
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Photos of Parakeldyshite (15)
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ⓘMolybdenum Mine, Takhtarvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia
ⓘAlluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
This page provides mineralogical data about Parakeldyshite.


Unique Identifiers
First published:
1977
Type description 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.

Classification of Parakeldyshite
Dana 8th ed.:
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
Hey's CIM Ref.:
14.10.4

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Mineral Symbols
Colour:
White, pale blue
Hardness:
5½ - 6 onMohs scale
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 Parakeldyshite
Surface Relief:
High
Dispersion:
r > v strong
Optical Extinction:
Y ≈ c; X ≈ b; Z ≈ a.

Chemistry of Parakeldyshite
Common Impurities:
Ti,Hf,Al,Fe,Mg,Ca,K,H2O

Crystallography of Parakeldyshite
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:
EudialyteKhibinskiteZircon
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 Parakeldyshite

Other Language Names for Parakeldyshite

Common AssociatesTric.1 :P19.BC.KozłowskiiteCa4Fe2+2Sn3(Si2O7)2(Si2O6OH)2Tric. 19.BC.05Yttrialite-(Y)(Y,Th)2Si2O7Mon. 2/m :P21/m9.BC.05ThortveititeSc2Si2O7Mon. 2/m :B2/m9.BC.05Keiviite-(Y)Y2Si2O7Mon. 2/m :B2/m9.BC.05Keiviite-(Yb)Yb2Si2O7Mon. 2/m :B2/m9.BC.05GittinsiteCaZrSi2O7Mon. 2 :B29.BC.10Keldyshite(Na,H)2ZrSi2O7Tric.1 :P19.BC.10KhibinskiteK2ZrSi2O7Mon. 2/m :B2/m9.BC.15RankiniteCa3Si2O7Mon. 2/m :P21/b9.BC.20BarysilitePb8Mn2+[Si2O7]3Trig.3m(32/m) :R3c9.BC.25Edgarbaileyite[Hg2]2+3[Si2O7]Mon.9.BC.30KristianseniteCa4Sc2Sn2(Si2O7)2(Si2O6OH)2Tric. 19.BC.30SilesiaiteCa4Fe3+2Sn2(Si2O7)2(Si2O6OH)2Tric. 19.BC.35Percleveite-(Ce)Ce2Si2O7Tet. 4 :P419.BC.35Percleveite-(La)La2Si2O7Tet. 4 :P419.BC.40ScottyiteBaCu2Si2O7Orth.mmm(2/m2/m2/m) :Pmna

Fluorescence of Parakeldyshite

Other Information
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    • References for ParakeldyshiteⓘPoudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)Grice (1989)+1 other reference
    Germany
     
    Skrzyńska et al. (2023)
    Norway
     
    Raade et al. (1977)
    Russia
     
    Pavel.M. Kartashov (n.d.)Yakovenchuk et al. (2019)Arzamastsev et al. (2008)Pekov (1998)Pekov (1998)Pekov (2003)Pavel.M. Kartashov (n.d.)Pakhomovsky et al. (2014)Petrovsky et al. (2012)Pekov (1998)
    South Africa
     
    Kamenetsky et al. (2014)R. Liferovich -L. Horváth p.c. 2004
    USA
     
    Prof. W. Stoll (pers. comm. 2004)+8 other references
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