Iraqite-(La) Mineral Data

General Iraqite-(La) Information

Chemical Formula:

K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40

Composition:

Molecular Weight = 1,634.63 gm

Potassium 2.63 % K 3.17 % K₂O

Sodium 0.28 % Na 0.38 % Na₂O

Calcium 8.58 % Ca 12.01 % CaO

Lanthanum 5.95 % La 6.98 % La₂O₃

Cerium 6.00 % Ce 7.03 % Ce₂O₃

Thorium 9.94 % Th 11.31 % ThO₂

Aluminum 0.50 % Al 0.94 % Al₂O₃

Silicon 26.98 % Si 57.71 % SiO₂

Oxygen 39.15 % O

______ ______

100.00 % 99.51 % = TOTAL OXIDE

Empirical Formula:

K_1.1La_0.7Ce_0.7Th_0.7Ca_3.5Na_0.2Si_15.7Al_0.3O₄₀

Environment:

In granite in contact with dolomitic marble containing olivine and diopside.

IMA Status:

Approved IMA 1976

Locality:

At Shakhi-Rash Mountain, Hero Town, Qala-Diza, Iraq. Link to MinDat.org Location Data.

Name Origin:

For the country of origin, Iraq and La in the composition.

Name Pronunciation:

Iraqite-(La)

Synonym:

Desourdyite

Ekanite

Iraqite-(La) Crystallography

Axial Ratios:

a:c = 1:1.94086

Cell Dimensions:

a = 7.61, c = 14.77, Z = 1; V = 855.36 Den(Calc)= 3.17

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/I_o): 2.64(1), 3.31(1), 5.28(1),

Physical Properties of Iraqite-(La)

Cleavage:

{???} Good, {???} Good, {???} Poor

Color:

Greenish yellow.

Density:

3.27

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Iraqite-(La)

Gladstone-Dale:

CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1853,KPDmeas= 0.1797,KC= 0.1934
Ncalc = 1.61 - 1.63

Optical Data:

Uniaxial (-), e=1.585, w=1.59, bire=0.0050.

Calculated Properties of Iraqite-(La)

Electron Density:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Iraqite-(La) =3.17 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Iraqite-(La)= 277.20 barns/electron
U=PE_Iraqite-(La) x r_electron= 838.94 barns/cc.

Radioactivity:

GRapi = 202,416.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Iraqite-(La) per GRapi unit = 4.94 (PPM)

Iraqite-(La) 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) 150.27 ± 37.57 grams of pure Iraqite-(La) .

**Estimated Radioactivity from Iraqite-(La)** - 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 / 8.45 cm	4,452,387	1.20E-04	202,416.06	66.55
100 gm / 3.92 cm	445,239	1.20E-05	20,241.61	6.65
10 gm / 1.82 cm	44,524	1.20E-06	2,024.16	0.67
1 gm / 8.45 mm	4,452	1.20E-07	202.42	0.07
0.1 gm / 3.92 mm	445	1.20E-08	20.24	0.01
0.01 gm / 1.82 mm	45	1.20E-09	2.02	0.00
0.001 gm / 0.84 mm	4	1.20E-10	0.20	0.00

Weight of pure Iraqite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.17 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

Iraqite-(La) Classification

Dana Class:

63.01.01.02 (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

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 Iraqite-(La) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Iraqite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Iraqite-(La)

K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40
Dana No: 63.01.01.02 Strunz No: 09.CH.10
Locality:

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