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Parakeldyshite

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Formula:
Na2ZrSi2O7
System:
Triclinic
Colour:
White, pale blue
Hardness:
5½ - 6
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.


Classification of Parakeldyshite

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 Parakeldyshite

Colour:
White, pale blue
Hardness (Mohs):
5½ - 6

Optical Data of Parakeldyshite

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 Parakeldyshite

Formula:
Na2ZrSi2O7
Elements listed in formula:
Common Impurities:
Ti,Hf,Al,Fe,Mg,Ca,K,H2O

Crystallography of Parakeldyshite

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 Volume:
V 299.34 ų (Calculated from Unit Cell)

Type Occurrence of Parakeldyshite

Relationship of Parakeldyshite to other Species

9.BC.05GittinsiteCaZrSi2O7
9.BC.05Keiviite-(Y)Y2Si2O7
9.BC.05Keiviite-(Yb)Yb2Si2O7
9.BC.05ThortveititeSc2Si2O7
9.BC.05Yttrialite-(Y)Y2Si2O7
9.BC.10KeldyshiteNa2ZrSi2O7
9.BC.10KhibinskiteK2ZrSi2O7
9.BC.15RankiniteCa3Si2O7
9.BC.20BarysilitePb8Mn(Si2O7)3
9.BC.25EdgarbaileyiteHg61+Si2O7
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)
9.BC.35Percleveite-(Ce)Ce2Si2O7
14.10.1ZirconZrSiO4
14.10.2HafnonHfSiO4
14.10.3ZektzeriteNaLiZrSi6O15
14.10.5VlasoviteNa2ZrSi4O11
14.10.6KeldyshiteNa2ZrSi2O7
14.10.7GaidonnayiteNa2ZrSi3O9 · 2H2O
14.10.8TerskiteNa4ZrSi6O16 · 2H2O
14.10.9ElpiditeNa2ZrSi6O15 · 3H2O
14.10.10HilairiteNa2ZrSi3O9 · 3H2O
14.10.11PetarasiteNa5Zr2Si6O18(Cl,OH) · 2H2O
14.10.12KhibinskiteK2ZrSi2O7
14.10.13WadeiteK2ZrSi3O9
14.10.14DalyiteK2ZrSi6O15
14.10.15KostyleviteK2ZrSi3O9 · H2O
14.10.16UmbiteK2ZrSi3O9 · H2O
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · 3H2O
14.10.18GeorgechaoiteKNaZrSi3O9 · 2H2O
14.10.19GittinsiteCaZrSi2O7
14.10.20CalciocatapleiiteCaZrSi3O9 · H2O
14.10.21CalciohilairiteCaZrSi3O9 · 3H2O
14.10.22ArmstrongiteCaZrSi6O15 · 2H2O
14.10.23LemoyniteNa2CaZr2Si10O26 · 5-6H2O
14.10.24CatapleiiteNa2ZrSi3O9 · 2H2O
14.10.25BaghdaditeCa3Zr(Si2O7)O2
14.10.26LovozeriteNa3CaZrSi6O15(OH)3
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti,Nb)(Si2O7)(O,OH,F)2
14.10.28PenkvilksiteNa4Ti2Si8O22 · 4H2O
14.10.29DarapiositeKNa2Mn2(Li2ZnSi12)O30
14.10.30BaziriteBaZrSi3O9
14.10.31KomkoviteBaZrSi3O9 · 3H2O
14.10.32ZirsinaliteNa6CaZrSi6O18
14.10.33TranquillityiteFe82+Ti3Zr2Si3O24

Other Names for Parakeldyshite

Name in Other Languages:

Other Information

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 Parakeldyshite

Reference List:
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 Parakeldyshite

mindat.org URL:
https://www.mindat.org/min-3094.html
Please feel free to link to this page.

Localities for Parakeldyshite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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
    • Murmanskaja Oblast'
      • Kola Peninsula
        • 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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