Arapovite Mineral Data

General Arapovite Information

Chemical Formula:

(U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20•H2O, x=0.5

Composition:

Molecular Weight = 897.66 gm

Potassium 3.70 % K 4.46 % K₂O

Sodium 1.87 % Na 2.52 % Na₂O

Calcium 5.76 % Ca 8.06 % CaO

Europium 0.17 % Eu 0.20 % Eu₂O₃

Lanthanum 0.15 % La 0.18 % La₂O₃

Cerium 0.47 % Ce 0.55 % Ce₂O₃

Samarium 0.17 % Sm 0.19 % Sm₂O₃

Dysprosium 0.18 % Dy 0.21 % Dy₂O₃

Thorium 9.31 % Th 10.59 % ThO₂

Uranium 14.58 % U 16.54 % UO₂

Silicon 25.03 % Si 53.55 % SiO₂

Hydrogen 0.20 % H 1.79 % H₂O

Lead 0.69 % Pb 0.75 % PbO

Neodymium 0.48 % Nd 0.56 % Nd₂O₃

Oxygen 37.23 % O

______ ______

100.00 % 100.14 % = TOTAL OXIDE

Empirical Formula:

U_0.55Th_0.36Pb_0.03Ce_0.03Nd_0.03La_0.01Sm_0.01Eu_0.01Dy_0.01Ca_1.29Na_0.73K_0.85Si₈O₂₀ï¿½0.89(H₂O)

Environment:

Steacyite group (4-membered double ring structure [Si8O20] unit. U4+ analogue of turkestanite and the U4+-Ca analogue of steacyite.

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:

Named for Yu. A. Arapov (1907-1988), a famous geologist and author of many works on the geochemistry, mineralogy and petrology of Middle Asia.

Synonym:

IMA2003-046

Arapovite Image

Images:

Arapovite

Comments: Dark green prismatic arapovite crystals with rectangular shapes.
Location: Dara-i-Pioz Glacier, Hait, Alayskiy (Alai) Range, Tien Shan Mountains, Tajikistan. Scale: See Image.
© Rruff Database

Arapovite Crystallography

Axial Ratios:

a:c = 1:1.95171

Cell Dimensions:

a = 7.6506, c = 14.9318, Z = 2; V = 873.98 Den(Calc)= 3.41

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-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)(120), 2.64(0.64)(024), 3.31(0.58)(014),2.161(0.45)(224), 5.28(0.38)(012), 1.644(0.3)(242), 2.016(0.29)(232), 5.34(0.23)(100), 1.821(0.21)(234),

Physical Properties of Arapovite

Cleavage:

None

Color:

Dark green.

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Intergrown Crystals - Occurs as intergrown crystalline aggregates

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Resinous

Optical Properties of Arapovite

Gladstone-Dale:

CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1796,KC= 0.1857
Ncalc = 1.63

Optical Data:

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

Calculated Properties of Arapovite

Electron Density:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Arapovite =3.41 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Arapovite= 582.34 barns/electron
U=PE_Arapovite x r_electron=1,868.69 barns/cc.

Radioactivity:

GRapi = 1,356,695.84 (Gamma Ray American Petroleum Institute Units)
Concentration of Arapovite per GRapi unit = 737.08 (PPB)

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) 22.42 ± 5.60 grams of pure Arapovite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2242.0 ±560.49 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 / 8.24 cm	30,276,027	8.18E-04	1,356,695.84	446.04
100 gm / 3.83 cm	3,027,603	8.18E-05	135,669.58	44.60
10 gm / 1.78 cm	302,760	8.18E-06	13,566.96	4.46
1 gm / 8.24 mm	30,276	8.18E-07	1,356.70	0.45
0.1 gm / 3.83 mm	3,028	8.18E-08	135.67	0.04
0.01 gm / 1.78 mm	303	8.18E-09	13.57	0.00
0.001 gm / 0.82 mm	30	8.18E-10	1.36	0.00

Weight of pure Arapovite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.41 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:

63.01.01.04 (63)Cyclosilicate Condensed Rings

(63.01)4-membered rings

(63.01.01)Steacyite Group

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

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

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

63.01.01.04 Arapovite! (U,Th)(Ca,Na)2(K1-x[]x)Si8O20•H2O,x=0.5 P 4/mcc 4/m 2/m 2/m

Strunz Class:

09.CH.10 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CH -[Si4O12]8- 4-membered double rings

09.CH.10 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m

09.CH.10 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m

09.CH.10 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20•n(H2O) P 4/mcc 4/m 2/m 2/m

09.CH.10 Arapovite! (U,Th)(Ca,Na)2(K1-x[]x)Si8O20•H2O,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 - 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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Arapovite

(U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20•H2O, x=0.5
Dana No: 63.01.01.04 Strunz No: 09.CH.10
Locality:

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