Moskvinite-(Y) Mineral Data

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General Moskvinite-(Y) Information

Chemical Formula:

Na2K(Y,REE) [Si6O15]

Composition:

Molecular Weight = 598.41 gm

Potassium 6.21 % K 7.48 % K₂O

Sodium 7.91 % Na 10.67 % Na₂O

Samarium 0.50 % Sm 0.58 % Sm₂O₃

Gadolinium 1.05 % Gd 1.21 % Gd₂O₃

Dysprosium 2.44 % Dy 2.80 % Dy₂O₃

Yttrium 11.44 % Y 14.53 % Y₂O₃

Holmium 0.55 % Ho 0.63 % Ho₂O₃

Erbium 1.12 % Er 1.28 % Er₂O₃

Terbium 0.27 % Tb 0.31 % Tb₂O₃

Silicon 28.16 % Si 60.24 % SiO₂

Neodymium 0.24 % Nd 0.28 % Nd₂O₃

Oxygen 40.11 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Na_2.06K_0.95Y_0.77Dy_0.09Gd_0.04Er_0.04Ho_0.02Sm_0.02Nd_0.01Tb_0.01Si₆O₁₅

Environment:

Coarse-grained reedmergnerite pegmatite boulder in the moraine. K and REE analogue of Na3 Y [Si6O15] - 3 membered double ring.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Moraine of the Dara-i-Pioz glacier, Alai mountain ridge, Tien-Shan Mountains, northern Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for A.V. Moskvin (1897-1974), Russian geologist.

Synonym:

IMA2002-031

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Moskvinite-(Y) Crystallography

Axial Ratios:

a:b:c =0.7096:1:0.5713

Cell Dimensions:

a = 10.623, b = 14.97, c = 8.553, Z = 4; V = 1,360.15 Den(Calc)= 2.92

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Ibmm

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

By Intensity(I/I_o): 4.98(1)(121), 3.26(0.85)(141), 3.05(0.75)(240,222),3.45(0.5)(310), 2.49(0.45)(060,242), 2.753(0.42)(103), 5.32(0.35),

Crystal Structure:

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Sokolova E V , Hawthorne F C , Agakhanov A A , Pautov L A , The Canadian Mineralogist , 41 (2003) p.513-520, The crystal structure of moskvinite-(Y), Na2K(Y,REE)[Si6O15], a new silicate, mineral with [Si6O15] three-membered double-rings from the Dara-I-Pioz Moraine,, Tien-Shan mountains, Tajikistan, Locality: Dara-I-Pioz Moraine, Tien-Shan mountains, Tajikistan

Physical Properties of Moskvinite-(Y)

Cleavage:

None

Color:

White.

Density:

2.91

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Moskvinite-(Y)

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1917,KPDmeas= 0.1923,KC= 0.1932
Ncalc = 1.56

Optical Data:

Biaxial (+), a=1.555, b=1.558, g=1.566, bire=0.0110, 2V(Calc)=64, 2V(Meas)=64. Dispersion r > v moderate.

Calculated Properties of Moskvinite-(Y)

Electron Density:

Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Moskvinite-(Y) =2.91 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Moskvinite-(Y)}= 60.78 barns/electron
U=PE_{Moskvinite-(Y)} x r_electron= 171.31 barns/cc.

Radioactivity:

GRapi = 6,494.10 (Gamma Ray American Petroleum Institute Units)
Concentration of Moskvinite-(Y) per GRapi unit = 153.99 (PPM)

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

**Estimated Radioactivity from Moskvinite-(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 / 8.69 cm	140,806	3.81E-06	6,494.10	2.14
100 gm / 4.03 cm	14,081	3.81E-07	649.41	0.21
10 gm / 1.87 cm	1,408	3.81E-08	64.94	0.02
1 gm / 8.69 mm	141	3.81E-09	6.49	0.00
0.1 gm / 4.03 mm	14	3.81E-10	0.65	0.00
0.01 gm / 1.87 mm	1	3.81E-11	0.06	0.00
0.001 gm / 0.87 mm	0	3.81E-12	0.01	0.00

Weight of pure Moskvinite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.91 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 ( 0.31 % Th) From Sum REE Elements ( 6.17 % REE)

Moskvinite-(Y) Classification

Dana Class:

63.03.01.01 (63)Cyclosilicate Condensed Rings

(63.03)3-membered rings

(63.03.01)Dana Group

63.03.01.01 Moskvinite-(Y)! Na2K(Y,REE)[Si6O15] Ibmm 2/m 2/m 2/m

Strunz Class:

09.CD.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CD -[Si3O9]6- 3-membered double rings

09.CD.05 Moskvinite-(Y)! Na2K(Y,REE)[Si6O15] Ibmm 2/m 2/m 2/m

Other Moskvinite-(Y) Information

References:

NAME( CanMin, 41:513, AmMin 89:1831) PHYS. PROP.(CanMin 41:513, AmMin 89:1831) OPTIC PROP.(AmMin 89:1831)

See Also:

Links to other databases for Moskvinite-(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
10 - Ruff.Info

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

Moskvinite-(Y)

Na2K(Y,REE) [Si6O15]
Dana No: 63.03.01.01 Strunz No: 09.CD.05
Locality:

Notes: