Pyatenkoite-(Y) Mineral Data

General Pyatenkoite-(Y) Information

Chemical Formula:

Na5(Y,Dy,Gd)TiSi6O18•6(H2O)

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

Empirical Formula:

Na₅Y_0.7Dy_0.1Gd_0.1TiSi₆O₁₈•6(H₂O)

Environment:

In hyperagpaitic pegmatites. The titanium-dominant analogue of sazykinaite-(Y)

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Mont Alluaiv in the northwestern part of the Lovozero alkaline massif, Kila Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For Yu. A. Pyatenko (1928-), prominent Russian crystal chemist.

Name Pronunciation:

Pyatenkoite-(Y) + Pronunciation

Synonym:

ICSD 83238

IMA1995-034

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Pyatenkoite-(Y) Crystallography

Axial Ratios:

a:c = 1:1.47045

Cell Dimensions:

a = 10.696, c = 15.728, Z = 3; V = 1,558.29 Den(Calc)= 2.63

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: R 32

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.21(1), 2.99(0.85), 5.99(0.6),2.661(0.4), 3.093(0.4),

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Forms: ( 0 1 2)

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Crystal Structure:

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Rastsvetaeva R K , Khomyakov A P , Doklady Chemistry , 351 (1996) p.283-286, Crystal structure of pyatenkoite-(Y) Na5YTiSi6O18*6H2O, a new mineral of the, hilairite group: crystal structure, Locality: Lovozero massif, Kola Peninsula, Russia

Physical Properties of Pyatenkoite-(Y)

Cleavage:

{0112} Indistinct

Color:

Colorless.

Density:

2.68

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pyatenkoite-(Y)

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

Optical Data:

Uniaxial (-), e=1.607, w=1.612, bire=0.0050.

Calculated Properties of Pyatenkoite-(Y)

Electron Density:

Bulk Density (Electron Density)=2.59 gm/cc
note: Specific Gravity of Pyatenkoite-(Y) =2.63 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Pyatenkoite-(Y)}= 38.02 barns/electron
U=PE_{Pyatenkoite-(Y)} x r_electron= 98.65 barns/cc.

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 Becquerels (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

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

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

References:

NAME( MinRec, Vol. 28, No. 3) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(MinRec, Vol. 28, No. 3)

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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Print or Cut-and-Paste your Pyatenkoite-(Y) Specimen Label here :

Pyatenkoite-(Y)

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

Notes: