Arapovite Mineral Data (original) (raw)

General Arapovite Information

Help on Chemical Formula: Chemical Formula:

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

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

U0.55Th0.36Pb0.03Ce0.03Nd0.03La0.01Sm0.01Eu0.01Dy0.01Ca1.29Na0.73K0.85Si8O20�0.89(H2O)

Help on Environment: Environment:

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

Help on IMA Status: IMA Status:

Approved IMA 2004 (Dana # Added)

Help on Locality: Locality:

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

Help on Name Origin: 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.

Help on Synonym: Synonym:

IMA2003-046

Arapovite Image

Click Here for Larger Arapovite Image in a New Browser Window Images:

Click Here for Larger Arapovite Image 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

Help on Axial Ratios: Axial Ratios:

a:c = 1:1.95171

Help on Cell Dimensions: Cell Dimensions:

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

Help on Crystal System: 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/Io): 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),

Click Here for Large Arapovite Structure Window 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

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Dark green.

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

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

Help on Habit: Habit:

Inclusions - Generally found as inclusions in other minerals.

Help on Habit: Habit:

Intergrown Crystals - Occurs as intergrown crystalline aggregates

Help on Hardness: Hardness:

5.5-6 - Knife Blade-Orthoclase

Help on Luster: Luster:

Vitreous - Resinous

Optical Properties of Arapovite

Help on Gladstone-Dale: Gladstone-Dale:

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

Help on Optical Data: Optical Data:

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

Calculated Properties of Arapovite

Help on Electron Density: Electron Density:

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

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEArapovite = 582.34 barns/electron
U=PEArapovite x relectron=1,868.69 barns/cc.

Help on Radioactivity: 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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor 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

Help on Dana Class: 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

Help on Strunz Class: 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

Help on References: References:

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

Help on See Also: 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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Ask about Arapovite here :
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Print or Cut-and-Paste your Arapovite Specimen Label here :

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:

Notes: