Arapovite Mineral Data

Arapovite Mineral Data

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General Arapovite Information

Chemical Formula:

(U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20, x~0.5

Composition:

Molecular Weight = 853.66 gm

Potassium 2.38 % K 2.87 % K₂O

Barium 0.16 % Ba 0.18 % BaO

Sodium 1.83 % Na 2.47 % Na₂O

Calcium 6.24 % Ca 8.74 % CaO

Cerium 0.49 % Ce 0.58 % Ce₂O₃

Praeseodymium 0.17 % Pr 0.19 % Pr₂O₃

Samarium 0.18 % Sm 0.20 % Sm₂O₃

Dysprosium 0.38 % Dy 0.44 % Dy₂O₃

Thorium 7.07 % Th 8.04 % ThO₂

Uranium 16.45 % U 18.66 % UO₂

Silicon 26.32 % Si 56.31 % SiO₂

Neodymium 0.84 % Nd 0.99 % Nd₂O₃

Oxygen 37.48 % O

______ ______

100.00 % 99.66 % = TOTAL OXIDE

Empirical Formula:

U_0.59Th_0.26Ca_0.1Dy_0.02Sm_0.01Pr_0.01Ca_1.23Na_0.68Nd_0.05Ce_0.03Ba_0.01K_0.52Si₈O₂₀

Environment:

Steacyite group (4-membered double ring structure [Si8O20] unit.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

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

Name Origin:

Presumably named for the locality.

Synonym:

IMA2003-046

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Arapovite Crystallography

Axial Ratios:

a:c = 1:1.95171

Cell Dimensions:

a = 7.6506, c = 14.9318, Z = 2; V = 873.98 Den(Calc)= 3.24

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mcc

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

By Intensity(I/I_o): 3.37(1), 2.64(0.64), 3.31(0.59),2.161(0.45), 5.28(0.38), 1.644(0.3), 2.016(0.29), 5.34(0.23), 2.515(0.21),

Crystal Structure:

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Uvarova Y A , Sokolova E V , Hawthorne F C , Agakhanov A A , Pautov L A , The Canadian Mineralogist , 42 (2004) p.1005-1011

Physical Properties of Arapovite

Color:

Dark green.

Diaphaniety:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Arapovite

Gladstone-Dale:

CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KC= 0.1813

Optical Data:

Uniaxial (-), e=1.61, w=1.615, bire=0.0050.

Calculated Properties of Arapovite

Electron Density:

r_electron=3.05 gm/cc
note: r_Arapovite=3.24 gm/cc.

Fermion Index

Fermion Index = 0.01793
Boson Index = 0.98207

Photoelectric:

PE_Arapovite= 569.71 barns/electron
U=PE_Arapovite x r_electron=1,736.20 barns/cc.

Radioactivity:

GRapi = 1,460,807.22 (Gamma Ray American Petroleum Institute Units)

Arapovite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 20.82 ± 5.21 grams of pure Arapovite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2082.2 ±520.55 grams of pure Arapovite .

**Estimated Radioactivity from Arapovite** - very strong
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 / 8.38 cm	32,614,703	8.81E-04	1,460,807.22	480.27
100 gm / 3.89 cm	3,261,470	8.81E-05	146,080.72	48.03
10 gm / 1.81 cm	326,147	8.81E-06	14,608.07	4.80
1 gm / 8.38 mm	32,615	8.81E-07	1,460.81	0.48
0.1 gm / 3.89 mm	3,261	8.81E-08	146.08	0.05
0.01 gm / 1.81 mm	326	8.81E-09	14.61	0.00
0.001 gm / 0.84 mm	33	8.81E-10	1.46	0.00

Weight of pure Arapovite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.24 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

Arapovite Classification

Dana Class:

63.1.1.4 (63)Cyclosilicate Condensed Rings

(63.1)Steacyite group (4x2) Double Rings

(63.1.1)Eudialyte subgroup

63.1.1.1 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m

63.1.1.2 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m

63.1.1.3 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20·n(H2O) P 4/mcc 4/m 2/m 2/m

63.1.1.4 Arapovite ! (U,Th)(Ca,Na)2(K1-x[]x)Si8O20,x~0.5 P 4/mcc 4/m 2/m 2/m

Strunz Class:

VII/E.10-50 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-

VII/E.10 - Asselbornite - Walpurgite series

VII/E.10-10 Asselbornite (Pb,Ba)(UO2)6(BiO)4(AsO4)2(OH)12·3(H2O) I m3m 4/m 3 2/m

VII/E.10-12 Phosphowalpurgite! (UO2)Bi4(PO4)O4·2(H2O) P1 1

VII/E.10-15 Orthowalpurgite (UO2)Bi4O4(AsO4)2·2(H2O) Pbcm 2/m 2/m 2/m

VII/E.10-20 Walpurgite Bi4(UO2)(AsO4)2O4·2(H2O) P1 1

VII/E.10-50 Arapovite (U,Th)(Ca,Na)2(K1-x[]x)Si8O20,x~0.5 P 4/mcc 4/m 2/m 2/m

Other Arapovite Information

References:

NAME( CanMin, 42:1005) PHYS. PROP.(CanMin, 42:1005)

See Also:

Links to other databases for Arapovite :
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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Arapovite

(U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20, x~0.5
Dana No: 63.1.1.4 Strunz No: VII/E.10-50
Locality:

Notes: