Pyatenkoite-(Y) Mineral Data

Pyatenkoite-(Y) Mineral Data +

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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.

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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Physical Properties of Pyatenkoite-(Y)

Cleavage:

[0112] Indistinct

Color:

Colorless.

Density:

2.68

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Pyatenkoite-(Y)

Electron Density:

r_electron=2.59 gm/cc
note: r_{Pyatenkoite-(Y)}=2.63 gm/cc.

Fermion Index

Fermion Index = 0.03927
Boson Index = 0.96073

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)

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

Dana Class:

59.2.3.4 (59)Cyclosilicate Three-Membered Rings

(59.2)hydrated

(59.2.3)Hilairite group

59.2.3.1 Hilairite Na2ZrSi3O9·3(H2O) R 3m 3 2/m

59.2.3.2 Calciohilairite CaZrSi3O9·3(H2O) R 32 3 2

59.2.3.3 Sazykinaite-(Y) Na5YZrSi6018·6(H2O) R 32 3 2

59.2.3.4 Pyatenkoite-(Y) ! Na5(Y,Dy,Gd)TiSi6O18·6(H2O) R 32 3 2

Strunz Class:

VIII/F.29-24 VIII - Silicates

VIII/F - Inosilicates (chain and band) Six chains [Si6O18]12- and six bands [Si12O30]12-

VIII/F.29 - Hilairite - Stokesite series

VIII/F.29-10 Hilairite Na2ZrSi3O9·3(H2O) R 3m 3 2/m

VIII/F.29-20 Calciohilairite CaZrSi3O9·3(H2O) R 32 3 2

VIII/F.29-24 Pyatenkoite-(Y) Na5(Y,Dy,Gd)TiSi6O18·6(H2O) R 32 3 2

VIII/F.29-25 Sazykinaite-(Y) Na5YZrSi6018·6(H2O) R 32 3 2

VIII/F.29-30 Stokesite CaSnSi3O9·2(H2O) Pnna 2/m 2/m 2/m

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Pyatenkoite-(Y)

Na5(Y,Dy,Gd)TiSi6O18·6(H2O)
Dana No: 59.2.3.4 Strunz No: VIII/F.29-24
Locality:

Notes: