Mineralogy Database

IMA2008-024 Mineral Data

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General IMA2008-024 Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na,REE,[ ])7(Nb,Ti)[Si2O7]2OF3
Help on Composition: Composition: Molecular Weight = 841.27 gm
   Sodium            5.47 %  Na    7.37 % Na2O
   Calcium          19.06 %  Ca   26.66 % CaO
   La,Ce,Pr,Nd,Sm,  17.12 %  RE   19.97 % REE2O3
   Titanium          1.42 %  Ti    2.37 % TiO2
   Niobium           8.28 %  Nb   11.85 % Nb2O5
   Silicon          13.35 %  Si   28.57 % SiO2
   Oxygen           28.53 %  O
   Fluorine          6.77 %  F     6.77 % F
                      -   %   F    -2.85 % -O=F2    
                   ______        ______ 
                   100.00 %      100.71 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Na2REENb0.75Ti0.25(Si2O7)2OF3
Help on Environment: Environment: Rinkite group
Help on IMA Status: IMA Status: Proposed IMA 2008 (Dana # Added)
Help on Locality: Locality: Rouma Island, Los Archipelago, Guinea Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals, Nomenclature and Classification (CNMNC)
 

IMA2008-024 Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6616:1:1.6626
Help on Cell Dimensions: Cell Dimensions: a = 7.473, b = 11.294, c = 18.778, Z = 4; beta = 101.6° V = 1,552.49 Den(Calc)= 3.60
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.057(1), 2.021(0.68), 1.68(0.6),2.689(0.46), 2.567(0.44), 2.79(0.4), 1.813(0.33), 2.004(0.33),
 

Optical Properties of IMA2008-024

Help on Optical Data: Optical Data: NCalc= 1.72 - from Gladstone-Dale relationship (KC = 0.1997) where Ncalc=Dcalc*KC+1
 

Calculated Properties of IMA2008-024

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of IMA2008-024 =3.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEIMA2008-024 = 116.96 barns/electron
U=PEIMA2008-024 x relectron= 402.66 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 17,522.79 (Gamma Ray American Petroleum Institute Units)
Concentration of IMA2008-024 per GRapi unit = 57.07 (PPM)

IMA2008-024 is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from IMA2008-024 - weak
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 / 8.10 cm 384,797 1.04E-05 17,522.79 5.76
100 gm / 3.76 cm 38,480 1.04E-06 1,752.28 0.58
10 gm / 1.74 cm 3,848 1.04E-07 175.23 0.06
1 gm / 8.10 mm 385 1.04E-08 17.52 0.01
0.1 gm / 3.76 mm 38 1.04E-09 1.75 0.00
0.01 gm / 1.74 mm 4 1.04E-10 0.18 0.00
0.001 gm / 0.81 mm 0 1.04E-11 0.02 0.00

Weight of pure IMA2008-024 in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.60 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
Estimated Thorium Activity ( 0.86 % Th) From Sum REE Elements (17.12 % REE)
 

IMA2008-024 Classification

Help on  Dana Class: Dana Class: 56.02.05.06 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.05)Mosandrite and related species
 
56.02.05.01 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
56.02.05.02 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
56.02.05.03 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 
56.02.05.04 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
56.02.05.05 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
56.02.05.06 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 
56.02.05.07 Dovyrenite! Ca6Zr[Si2O7]2(OH)4 Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BE.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.20 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
09.BE.20 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
09.BE.20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
09.BE.20 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 

Other IMA2008-024 Information

Help on See Also: See Also: Links to other databases for IMA2008-024 :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - Mineralienatlas (Deutsch)
7 - Online Mineral Museum
8 - Ruff.Info

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Print or Cut-and-Paste your IMA2008-024 Specimen Label here :

IMA2008-024

(Ca,Na,REE,[ ])7(Nb,Ti)[Si2O7]2OF3
Dana No: 56.02.05.06 Strunz No: 09.BE.20
Locality:

 

Notes:

 

 
   
 


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