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Parakeldyshite

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Formula:
Na2ZrSi2O7
Colour:
White, pale blue
Hardness:
5½ - 6
Crystal System:
Triclinic
Name:
Named in 1977 by Alexander Petrovich Khomyakov in honor of Mstislav Vsevolodovich Keldysh [February 10 (old calendar January 28), 1911 Riga, Russia - June 24, 1978], Russian mathematician and father of the first Earth space program and also named from the Greek παρα = beyond for the dehydrated nature of the species. Keldysh proposed and developed the first orbiting satellite, Sputnik, and was given the epithet "Chief Theoretician" by his colleagues in the Russian Space Program.
This page provides mineralogical data about Parakeldyshite.


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Classification of ParakeldyshiteHide

Approved
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

Physical Properties of ParakeldyshiteHide

Colour:
White, pale blue
Hardness:
5½ - 6 on Mohs scale

Optical Data of ParakeldyshiteHide

Type:
Biaxial (-)
RI values:
nα = 1.670 nβ = 1.692 nγ = 1.713
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong

Chemical Properties of ParakeldyshiteHide

Formula:
Na2ZrSi2O7
Common Impurities:
Ti,Hf,Al,Fe,Mg,Ca,K,H2O

Crystallography of ParakeldyshiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 6.62 Å, b = 8.81 Å, c = 5.43 Å
α = 92.7°, β = 94.23°, γ = 71.46°
Ratio:
a:b:c = 0.751 : 1 : 0.616
Unit Cell V:
299.34 ų (Calculated from Unit Cell)

Type Occurrence of ParakeldyshiteHide

Synonyms of ParakeldyshiteHide

Other Language Names for ParakeldyshiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Keldyshite8 photos of Parakeldyshite associated with Keldyshite on mindat.org.
Kentbrooksite3 photos of Parakeldyshite associated with Kentbrooksite on mindat.org.
Aegirine1 photo of Parakeldyshite associated with Aegirine on mindat.org.
Sodalite1 photo of Parakeldyshite associated with Sodalite on mindat.org.
Lorenzenite1 photo of Parakeldyshite associated with Lorenzenite on mindat.org.
Loparite-(Ce)1 photo of Parakeldyshite associated with Loparite-(Ce) on mindat.org.
Catapleiite1 photo of Parakeldyshite associated with Catapleiite on mindat.org.
Eudialyte1 photo of Parakeldyshite associated with Eudialyte on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BC.05GittinsiteCaZrSi2O7Mon.
9.BC.05Keiviite-(Y)Y2Si2O7
9.BC.05Keiviite-(Yb)Yb2Si2O7Mon. 2/m : B2/m
9.BC.05ThortveititeSc2Si2O7Mon.
9.BC.05Yttrialite-(Y)(Y,Th)2Si2O7
9.BC.10Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
9.BC.10KhibinskiteK2ZrSi2O7Mon.
9.BC.15RankiniteCa3Si2O7Mon. 2/m : P21/b
9.BC.20BarysilitePb8Mn2+[Si2O7]3Trig.
9.BC.25Edgarbaileyite(Hg-Hg)3Si2O7Mon.
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)Tric. 1
9.BC.35Percleveite-(Ce)(Ce,La,Nd)2Si2O7Tet. 4

Related Minerals - Dana Grouping (8th Ed.)Hide

55.2.2.1Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
55.2.2.2KhibinskiteK2ZrSi2O7Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.10.1ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.2HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.3ZektzeriteLiNaZrSi6O15Orth.
14.10.5VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
14.10.6Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
14.10.7GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
14.10.8TerskiteNa4ZrSi6O16 · 2H2OOrth.
14.10.9ElpiditeNa2ZrSi6O15 · 3H2OOrth.
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
14.10.11PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
14.10.12KhibinskiteK2ZrSi2O7Mon.
14.10.13WadeiteK2Zr(Si3O9)Hex.
14.10.14DalyiteK2ZrSi6O15Tric.
14.10.15KostyleviteK2Zr(Si3O9) · H2OMon.
14.10.16UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
14.10.18GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
14.10.19GittinsiteCaZrSi2O7Mon.
14.10.20CalciocatapleiiteCaZr(Si3O9) · 2H2O
14.10.21CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
14.10.22ArmstrongiteCaZr[Si6O15] · 3H2OMon.
14.10.23Lemoynite(Na,K)2CaZr2Si10O26 · 5H2OMon. 2/m : B2/b
14.10.24CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
14.10.25BaghdaditeCa3(Zr,Ti)(Si2O7)O2Mon.
14.10.26LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2Mon. 2/m : P21/b
14.10.28PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
14.10.29DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
14.10.30BaziriteBaZr(Si3O9)Hex.
14.10.31KomkoviteBaZr[Si3O9] · 3H2OTrig.
14.10.32ZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig.
14.10.33Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ParakeldyshiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1979): 64: 656-657.
I.V. Pekov, N.V. Zubkova, D.Y. Pushcharovsky, U. Kolitsch and E. Tillmanns (2007): Refined crystal structure of parakeldyshite and the genetic crystal chemistry of zirconium minerals with [Si2O7] diorthogroups. Crystallogr. Reports 52, 1066-1071.

Internet Links for ParakeldyshiteHide

Localities for ParakeldyshiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
Norway
 
  • Vestfold
    • Larvik
      • Hedrum
        • Lågendalen
Raade, G.& Mladeck, Michel H.(1977): Parakeldyshite from Norway. Canadian Mineralogist 15,102-107
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
        • Kukisvumchorr Mt
          • East slope
            • Tuliok River head
P.M. Kartashov data
        • Takhtarvumchorr Mt
Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., & Ivanyuk, G. (2008). The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. In Guidbook for 33rd International Geological Congress Excursion (No. 47, p. 58).
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
        • Yukspor Mt
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
      • Lovozero Massif
Pekov, I. et al (2003): New Data on Minerals: 38: 20-33.
Pavel M. Kartashov data
Pakhomovsky, Y. A., Ivanyuk, G. Y., & Yakovenchuk, V. N. (2014). Loparite-(Ce) in rocks of the Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 56(8), 685-698.
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
South Africa
 
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld Complex
R. Liferovich - L. Horváth p.c. (2004)
USA
 
  • New Mexico
    • Otero Co.
      • Cornudas Mts
Prof. W. Stoll (pers. comm. 2004); McLemore, V.T., Lueth, V.W., & Pease, T.C. (1996): Petrology and mineral resources of the Wind Mountain laccolith, New Mexico and Texas. Canadian Mineralogist, 34, 335-347. [http://rruff.info/doclib/cm/vol34/CM34_335.pdf]; USGS Open-File Report 02-189; Virginia T. McLemore and James R. Guilinger, (1993) Geology and mineral resources in the Cornudas Mountains, Otero County, New Mexico and Hudspeth County, Texas pp. 145-153 in Carlsbad Region (New Mexico and West Texas), Love, D. W.; Hawley, J. W.; Kues, B. S.; Austin, G. S.; Lucas, S. G.; [eds.], New Mexico Geological Society 44th Annual Fall Field Conference Guidebook, 357 p.
Mineral and/or Locality  
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