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Keldyshite

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Mstislav Keldysh
Formula:
(Na,H)2ZrSi2O7
Colour:
White
Lustre:
Vitreous, Greasy
Hardness:
3½ - 4½
Specific Gravity:
3.22 - 3.30
Crystal System:
Triclinic
Name:
Named in 1962 by Vasilii Ivanovich Gerasimovsky 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. 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 Keldyshite.


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Classification of KeldyshiteHide

Approved
9.BC.10

9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
55.2.2.1

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
14.10.6

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

Physical Properties of KeldyshiteHide

Vitreous, Greasy
Transparency:
Translucent
Colour:
White
Hardness:
3½ - 4½ on Mohs scale
Hardness:
VHN100=157 - 231 - Vickers
Tenacity:
Very brittle
Cleavage:
Poor/Indistinct
Two poor cleavages intersecting at ~90 degrees.
Fracture:
Irregular/Uneven
Density:
3.22 - 3.30 g/cm3 (Measured)    3.26 g/cm3 (Calculated)

Optical Data of KeldyshiteHide

Type:
Biaxial (-)
RI values:
nα = 1.670 nγ = 1.710
2V:
Measured: 78°
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemical Properties of KeldyshiteHide

Formula:
(Na,H)2ZrSi2O7
IMA Formula:
Na2ZrSi2O7
Common Impurities:
Ti,Fe,Ca,K

Crystallography of KeldyshiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.01 Å, b = 5.34 Å, c = 6.96 Å
α = 92.1°, β = 116.1°, γ = 88.1°
Ratio:
a:b:c = 1.687 : 1 : 1.303
Unit Cell V:
300.47 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Irregular grains
Twinning:
Very fine polysynthetic

Type Occurrence of KeldyshiteHide

Geological Setting of Type Material:
Primary mineral in foyaites.
Associated Minerals at Type Locality:

Synonyms of KeldyshiteHide

Other Language Names for KeldyshiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Parakeldyshite8 photos of Keldyshite associated with Parakeldyshite on mindat.org.
Aegirine4 photos of Keldyshite associated with Aegirine on mindat.org.
Eudialyte3 photos of Keldyshite associated with Eudialyte on mindat.org.
Ferrokentbrooksite2 photos of Keldyshite associated with Ferrokentbrooksite on mindat.org.
Albite2 photos of Keldyshite associated with Albite on mindat.org.
Catapleiite1 photo of Keldyshite associated with Catapleiite on mindat.org.
Feldspar Group1 photo of Keldyshite associated with Feldspar Group 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.10KhibinskiteK2ZrSi2O7Mon.
9.BC.10ParakeldyshiteNa2ZrSi2O7Tric.
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

55.2.2.2KhibinskiteK2ZrSi2O7Mon.
55.2.2.3ParakeldyshiteNa2ZrSi2O7Tric.

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.
14.10.4ParakeldyshiteNa2ZrSi2O7Tric.
14.10.5VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
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 KeldyshiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1962): 47: 1216.
Doklady Akademii Nauk SSSR: 142: 916-918.
Trudy Mineralogicheskogo Muzeya Academii Nauk SSSR: 25: 90-95.
Doklady Akademii Nauk SSSR: 238: 573-575.
Soviet Physics – Doklady (1978): 23: 8-10.

Internet Links for KeldyshiteHide

Localities for KeldyshiteHide

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.
Libya
 
  • Al Kufrah District
Flinn et al (1992)
Flinn et al. (1992)
Morocco
 
  • Dakhla-Oued Ed-Dahab Region
Bea, F., Montero, P., Haissen, F., & El Archi, A. (2013). 2.46 Ga kalsilite and nepheline syenites from the Awsard pluton, Reguibat Rise of the West African Craton, Morocco. Generation of extremely K-rich magmas at the Archean–Proterozoic transition. Precambrian Research, 224, 242-254.
Norway
 
  • Vestfold
    • Larvik
      • Hedrum
        • Lågendalen
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p
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
      • Lovozero Massif
[World of Stones 95:5-6, p64]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Yakovenchik, V.N., Ivaniuk, G.Yu., Pakhomovsky, Ya.A., Selivanova, E.A., Men'shikov, Yu.P., Korchak, J.A., Krivovichev, S.V., Spiridonova, D.V., Zalkind, O.A. (2010): Punkaruaivite, Li{Ti2(OH)2[Si4O11(OH)]}•H2O, a new mineral species from hydrothermalites of Khibiny and Lovozero alkaline massifs (Kola Peninsula, Russia). Canadian Mineralogist, 48, 41-50.
Pavel M. Kartashov data
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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