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Pyatenkoite-(Y) Mineral Data

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General Pyatenkoite-(Y) Information

Help on Chemical  Formula: Chemical Formula: Na5(Y,Dy,Gd)TiSi6O18•6(H2O)
Help on Composition: Composition: Molecular Weight = 821.63 gm
   Sodium      13.99 %  Na   18.86 % Na2O
   Gadolinium   1.91 %  Gd    2.21 % Gd2O3
   Dysprosium   1.98 %  Dy    2.27 % Dy2O3
   Yttrium      7.57 %  Y     9.62 % Y2O3
   Titanium     5.83 %  Ti    9.72 % TiO2
   Silicon     20.51 %  Si   43.88 % SiO2
   Hydrogen     1.47 %  H    13.16 % H2O
   Oxygen      46.73 %  O
              ______        ______ 
              100.00 %       99.71 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na5Y0.7Dy0.1Gd0.1TiSi6O18•6(H2O)
Help on Environment: Environment: In hyperagpaitic pegmatites. The titanium-dominant analogue of sazykinaite-(Y)
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: Mont Alluaiv in the northwestern part of the Lovozero alkaline massif, Kila Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Yu. A. Pyatenko (1928-), prominent Russian crystal chemist.
Help on Name Pronunciation: Name Pronunciation: Pyatenkoite-(Y) + Pronunciation Say PYATENKOITE-(Y)
Help on Synonym: Synonym: ICSD 83238
  IMA1995-034
 

Pyatenkoite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.47045
Help on Cell Dimensions: Cell Dimensions: a = 10.696, c = 15.728, Z = 3; V = 1,558.29 Den(Calc)= 2.63
Help on Crystal System: Crystal System: Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: R 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.21(1), 2.99(0.85), 5.99(0.6),2.661(0.4), 3.093(0.4),
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Physical Properties of Pyatenkoite-(Y)

Help on Cleavage: Cleavage: {0112} Indistinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.68
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Pyatenkoite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2274,KC= 0.2317
Ncalc = 1.61 - 1.62
Help on Optical Data: Optical Data: Uniaxial (-), e=1.607, w=1.612, bire=0.0050.
 

Calculated Properties of Pyatenkoite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.59 gm/cc
note: Specific Gravity of Pyatenkoite-(Y) =2.63 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEPyatenkoite-(Y) = 38.02 barns/electron
U=PEPyatenkoite-(Y) x relectron= 98.65 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,095.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Pyatenkoite-(Y) per GRapi unit = 244.18 (PPM)

Pyatenkoite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Pyatenkoite-(Y) - mild
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.99 cm 87,173 2.36E-06 4,095.36 1.35
100 gm / 4.17 cm 8,717 2.36E-07 409.54 0.13
10 gm / 1.94 cm 872 2.36E-08 40.95 0.01
1 gm / 8.99 mm 87 2.36E-09 4.10 0.00
0.1 gm / 4.17 mm 9 2.36E-10 0.41 0.00
0.01 gm / 1.94 mm 1 2.36E-11 0.04 0.00
0.001 gm / 0.90 mm 0 2.36E-12 0.00 0.00

Weight of pure Pyatenkoite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.63 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.19 % Th) From Sum REE Elements ( 3.89 % REE)
 

Pyatenkoite-(Y) Classification

Help on  Dana Class: Dana Class: 59.02.03.04 (59)Cyclosilicate Three-Membered Rings
  (59.02)hydrated
  (59.02.03)Hilairite group
 
59.02.03.01 Hilairite Na2ZrSi3O9•3(H2O) R 3m 3 2/m
 
59.02.03.02 Calciohilairite CaZrSi3O9•3(H2O) R 32 3 2
 
59.02.03.03 Sazykinaite-(Y) Na5YZrSi6018•6(H2O) R 32 3 2
 
59.02.03.04 Pyatenkoite-(Y)! Na5(Y,Dy,Gd)TiSi6O18•6(H2O) R 32 3 2
Help on  Strunz Class: Strunz Class: 09.DM.10 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DM -Inosilicates with 6-periodic single chains
 
09.DM.10 Calciohilairite CaZrSi3O9•3(H2O) R 32 3 2
 
09.DM.10 Hilairite Na2ZrSi3O9•3(H2O) R 3m 3 2/m
 
09.DM.10 Komkovite BaZrSi3O9•3(H2O) R 32 3 2
 
09.DM.10 Pyatenkoite-(Y)! Na5(Y,Dy,Gd)TiSi6O18•6(H2O) R 32 3 2
 
09.DM.10 Sazykinaite-(Y) Na5YZrSi6018•6(H2O) R 32 3 2
 

Other Pyatenkoite-(Y) Information

Help on References: References: NAME( MinRec, Vol. 28, No. 3) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(MinRec, Vol. 28, No. 3)
Help on See Also: See Also: Links to other databases for Pyatenkoite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Pyatenkoite-(Y)

Na5(Y,Dy,Gd)TiSi6O18•6(H2O)
Dana No: 59.02.03.04 Strunz No: 09.DM.10
Locality:

 

Notes:

 

 
   
 


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