IMA2008-024 Mineral Data

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General IMA2008-024 Information

Chemical Formula:

(Ca,Na,REE,[ ])7(Nb,Ti)[Si2O7]2OF3

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

Empirical Formula:

Ca₄Na₂REENb_0.75Ti_0.25(Si₂O₇)₂OF₃

Environment:

Rinkite group

IMA Status:

Proposed IMA 2008 (Dana # Added)

Locality:

Rouma Island, Los Archipelago, Guinea Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

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IMA2008-024 Crystallography

Axial Ratios:

a:b:c =0.6616:1:1.6626

Cell Dimensions:

a = 7.473, b = 11.294, c = 18.778, Z = 4; beta = 101.6° V = 1,552.49 Den(Calc)= 3.60

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Optical Data:

NCalc= 1.72 - from Gladstone-Dale relationship (KC = 0.1997) where Ncalc=Dcalc*KC+1

Calculated Properties of IMA2008-024

Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of IMA2008-024 =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_IMA2008-024= 116.96 barns/electron
U=PE_IMA2008-024 x r_electron= 402.66 barns/cc.

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

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

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

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 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - 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: