Iraqite-(La) Mineral Data

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.

Synonym:

Desourdyite

Ekanite

Search for Iraqite-(La) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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 DipyramidalH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Iraqite-(La)

Electron Density:

r_electron=3.03 gm/cc
note: r_Iraqite-(La)=3.17 gm/cc.

Fermion Index

Fermion Index = 0.01295
Boson Index = 0.98705

Photoelectric:

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

Radioactivity:

GRapi = 202,415.87 (Gamma Ray American Petroleum Institute Units)

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	4,452,385	1.20E-04	202,415.87	66.55
100 gm / 3.92 cm	445,239	1.20E-05	20,241.59	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:

63.1.1.2 (63)Cyclosilicate Condensed Rings

(63.1)Steacyite group (4x2) Double Rings

(63.1.1)Eudialyte subgroup

63.1.1.1 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m

63.1.1.2 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m

63.1.1.3 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20·n(H2O) P 4/mcc 4/m 2/m 2/m

63.1.1.4 Arapovite! (U,Th)(Ca,Na)2(K1-x[]x)Si8O20,x~0.5 P 4/mcc 4/m 2/m 2/m

Strunz Class:

VIII/E.10-20 VIII - Silicates

VIII/E - Cyklosilicates, double quadruplet rings [Si8O20]8-

VIII/E.10 - Ekanite - Steacyite series

VIII/E.10-10 Ekanite ThCa2Si8O20 I 422 4 2 2

VIII/E.10-20 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m

VIII/E.10-30 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m

VIII/E.10-40 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20·n(H2O) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

Search for Iraqite-(La) using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Iraqite-(La) :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Iraqite-(La) Mineral Data :

Ask about Iraqite-(La) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Iraqite-(La) Specimen Label here :

Iraqite-(La)

K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40
Dana No: 63.1.1.2 Strunz No: VIII/E.10-20
Locality:

Notes: