General Arapovite Information
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Chemical Formula: |
(U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20, x~0.5 |
Composition: |
Molecular Weight = 853.66 gm |
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Potassium 2.38 % K 2.87 % K2O |
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Barium 0.16 % Ba 0.18 % BaO |
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Sodium 1.83 % Na 2.47 % Na2O |
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Calcium 6.24 % Ca 8.74 % CaO |
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Cerium 0.49 % Ce 0.58 % Ce2O3 |
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Praeseodymium 0.17 % Pr 0.19 % Pr2O3 |
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Samarium 0.18 % Sm 0.20 % Sm2O3 |
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Dysprosium 0.38 % Dy 0.44 % Dy2O3 |
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Thorium 7.07 % Th 8.04 % ThO2 |
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Uranium 16.45 % U 18.66 % UO2 |
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Silicon 26.32 % Si 56.31 % SiO2 |
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Neodymium 0.84 % Nd 0.99 % Nd2O3 |
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Oxygen 37.48 % O |
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______ ______ |
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100.00 % 99.66 % = TOTAL OXIDE |
Empirical Formula: |
U0.59Th0.26Ca0.1Dy0.02Sm0.01Pr0.01Ca1.23Na0.68Nd0.05Ce0.03Ba0.01K0.52Si8O20 |
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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Search for Arapovite Images |
Images:
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Arapovite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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Physical Properties of Arapovite
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Color: |
Dark green. |
Diaphaniety: |
Transparent |
Luster: |
Vitreous (Glassy) |
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Optical Properties of Arapovite
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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. |
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Calculated Properties of Arapovite
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Electron Density: |
relectron=3.05 gm/cc note: rArapovite =3.24 gm/cc. |
Fermion Index |
Fermion Index = 0.01793 Boson Index = 0.98207 |
Photoelectric: |
PEArapovite = 569.71 barns/electron U=PEArapovite x relectron=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
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Arapovite Classification
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Dana Class: |
63.1.1.4 (63)Cyclosilicate Condensed Rings |
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(63.1)Steacyite group (4x2) Double Rings |
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(63.1.1)Eudialyte subgroup |
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63.1.1.1 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m |
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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 |
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63.1.1.3 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20·n(H2O) P 4/mcc 4/m 2/m 2/m |
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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 |
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VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6- |
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VII/E.10 - Asselbornite - Walpurgite series |
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VII/E.10-10 Asselbornite (Pb,Ba)(UO2)6(BiO)4(AsO4)2(OH)12·3(H2O) I m3m 4/m 3 2/m |
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VII/E.10-12 Phosphowalpurgite! (UO2)Bi4(PO4)O4·2(H2O) P1 1 |
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VII/E.10-15 Orthowalpurgite (UO2)Bi4O4(AsO4)2·2(H2O) Pbcm 2/m 2/m 2/m |
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VII/E.10-20 Walpurgite Bi4(UO2)(AsO4)2O4·2(H2O) P1 1 |
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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 |
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Other Arapovite Information
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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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Print or Cut-and-Paste your Arapovite Specimen Label here :
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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:
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