Mineralogy Database

Arapovite Mineral Data

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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

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  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 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/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),
 

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
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

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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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:

 

 
   
 


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