IMA2002-042a Mineral Data

IMA2002-042a Mineral Data

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General IMA2002-042a Information

Chemical Formula:

Na3La[Si6O15]·2(H2O)

Composition:

Molecular Weight = 652.41 gm

Sodium 10.57 % Na 14.25 % Na₂O

Lanthanum 21.29 % La 24.97 % La₂O₃

Silicon 25.83 % Si 55.26 % SiO₂

Hydrogen 0.62 % H 5.52 % H₂O

Oxygen 41.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₃LaSi₆O₁₅·2(H₂O)

Environment:

La-dominant analogue of sazhinite

IMA Status:

Proposed IMA 2004 (Dana # Added)

Locality:

Aris intrusion, Namibia Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

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IMA2002-042a Crystallography

Axial Ratios:

a:b:c =0.4779:1:0.4617

Cell Dimensions:

a = 7.415, b = 15.515, c = 7.164, Z = 2; V = 824.17 Den(Calc)= 2.63

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmm2

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

By Intensity(I/I_o): 3.411(1), 3.252(0.83), 5.26(0.68),5.36(0.6), 7.42(0.59), 6.5(0.48), 3.226(0.45), 3.345(0.45),

Optical Properties of IMA2002-042a

Optical Data:

NCalc= 1.52 - from Gladstone-Dale relationship (KC = 0.1977) where Ncalc=Dcalc*KC+1

Calculated Properties of IMA2002-042a

Electron Density:

r_electron=2.53 gm/cc
note: r_IMA2002-042a=2.63 gm/cc.

Fermion Index

Fermion Index = 0.01245
Boson Index = 0.98755

Photoelectric:

PE_IMA2002-042a= 96.30 barns/electron
U=PE_IMA2002-042a x r_electron= 243.80 barns/cc.

Radioactivity:

GRapi = 21,860.87 (Gamma Ray American Petroleum Institute Units)

IMA2002-042a is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from IMA2002-042a** - 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 / 8.99 cm	476,922	1.29E-05	21,860.87	7.19
100 gm / 4.17 cm	47,692	1.29E-06	2,186.09	0.72
10 gm / 1.94 cm	4,769	1.29E-07	218.61	0.07
1 gm / 8.99 mm	477	1.29E-08	21.86	0.01
0.1 gm / 4.17 mm	48	1.29E-09	2.19	0.00
0.01 gm / 1.94 mm	5	1.29E-10	0.22	0.00
0.001 gm / 0.90 mm	0	1.29E-11	0.02	0.00

Weight of pure IMA2002-042a in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.63 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 ( 1.06 % Th) From Sum REE Elements (21.29 % REE)

IMA2002-042a Classification

Dana Class:

72.2.1.4 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.2)with 4-, 6-, and 8-membered rings

(72.2.1)Dalylite group

72.2.1.1 Dalyite K2ZrSi6O15 P1 1

72.2.1.2 Davanite K2TiSi6O15 P1 1

72.2.1.3 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]·n(H2O),(n>=1.5) Pmm2 mm2

72.2.1.4 IMA2002-042a ! Na3La[Si6O15]·2(H2O) Pmm2 2/m 2/m 2/m

Strunz Class:

VIII/HX.00-00 VIII - Silicates

VIII/HX - Unclassified Strunz Phyllosilicates

VIII/HX.00 - Dalylite group

Other IMA2002-042a Information

See Also:

Links to other databases for IMA2002-042a :
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)

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Print or Cut-and-Paste your IMA2002-042a Specimen Label here :

IMA2002-042a

Na3La[Si6O15]·2(H2O)
Dana No: 72.2.1.4 Strunz No: VIII/HX.00-00
Locality:

Notes: