Parakeldyshite Mineral Data + 
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- 55.2.2.1 Keldyshite Na2-xHxZrSi2O7·n(H2O) P1 1
- 55.2.2.2 Khibinskite K2ZrSi2O7 B2/m 2/m
- 55.2.2.3 Parakeldyshite Na2ZrSi2O7 P1 1
- VIII/C.04-10 Keldyshite Na2-xHxZrSi2O7·n(H2O) P1 1
- VIII/C.04-20 Parakeldyshite Na2ZrSi2O7 P1 1
- VIII/C.04-30 Khibinskite K2ZrSi2O7 B2/m 2/m
General Parakeldyshite Information |
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 Chemical Formula: |
Na2ZrSi2O7 | ||
| Composition: |
Molecular Weight = 305.37 gm | ||
| Sodium 15.06 % Na 20.30 % Na2O | |||
| Zirconium 29.87 % Zr 40.35 % ZrO2 | |||
| Silicon 18.39 % Si 39.35 % SiO2 | |||
| Oxygen 36.68 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Na2ZrSi2O7 | ||
| IMA Status: |
Approved IMA 1975 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 24866 | ||
| PDF 39-209 | |||
Parakeldyshite Image | |||
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Images:
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Parakeldyshite Crystallography |
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| Axial Ratios: |
a:b:c =0.8201:1:1.3328 | ||
| Cell Dimensions: |
a = 5.419, b = 6.607, c = 8.806, Z = 2; alpha = 71.5°, beta = 87.15°, gamma = 85.63° V = 297.75 Den(Calc)= 3.41 | ||
| Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.963(1), 2.913(0.9), 4.179(0.8), | ||
Physical Properties of Parakeldyshite |
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| Color: |
Bluish white, White. | ||
| Density: |
3.39 | ||
| Diaphaniety: |
Translucent | ||
| Hardness: |
5.5-6 - Knife Blade-Orthoclase | ||
| Luminescence: |
Fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Parakeldyshite |
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| Gladstone-Dale: |
CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2028,KPDmeas= 0.204,KC= 0.2056 |
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| Optical Data: |
Biaxial (-), a=1.67, b=1.692, g=1.713, bire=0.0430 | ||
| Pleochroism (x): |
colorless. | ||
| Pleochroism (y): |
colorless. | ||
| Pleochroism (z): |
colorless. | ||
Calculated Properties of Parakeldyshite |
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| Electron Density: |
relectron=3.24 gm/cc |
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| Fermion Index |
Fermion Index = 0.04228 Boson Index = 0.95772 |
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| Photoelectric: |
PEParakeldyshite = 41.12 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Parakeldyshite is Not Radioactive |
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Parakeldyshite Classification |
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| Dana Class: |
55.2.2.3 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions | ||
| (55.2)with cations in [6] coordination | |||
| (55.2.2)Keldyshite group | |||
| Strunz Class: |
VIII/C.04-20 VIII - Silicates | ||
| VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders | |||
| VIII/C.04 - Keldyshite - Khibinskite series | |||
Other Parakeldyshite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Parakeldyshite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 -École des Mines de Paris Search for Parakeldyshite using: Visit our Advertisers for Parakeldyshite : Translate Parakeldyshite Mineral Data : Ask about Parakeldyshite here : Print or Cut-and-Paste your Parakeldyshite Specimen Label here :
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