Allanite-(Ce) Mineral Data

General Allanite-(Ce) Information

Chemical Formula:

(Ce,Ca,Y)2(Al,Fe+++)3(SiO4)3(OH)

Composition:

Molecular Weight = 614.71 gm

Calcium 3.91 % Ca 5.47 % CaO

Cerium 27.35 % Ce 32.04 % Ce₂O₃

Yttrium 4.34 % Y 5.51 % Y₂O₃

Aluminum 9.88 % Al 18.66 % Al₂O₃

Iron 6.81 % Fe 9.74 % Fe₂O₃

Silicon 13.71 % Si 29.32 % SiO₂

Hydrogen 0.16 % H 1.47 % H₂O

Oxygen 33.84 % O

______ ______

100.00 % 102.21 % = TOTAL OXIDE

Empirical Formula:

Ce_1.2Ca_0.6Y_0.3Al_2.25Fe³⁺_0.75(SiO₄)₃(OH)

IMA Status:

Valid Species (Pre-IMA) 1810 - Dana Number Modified from 58.2.1a.1

Locality:

Greenland, Qaqarssuatsiaq Link to MinDat.org Location Data.

Name Origin:

Named after the Scottish mineralogist, T. Allan (1777-1833).

Name Pronunciation:

Allanite-(Ce)

Synonym:

ICSD 15190

Orthite

PDF 25-169

Allanite-(Ce) Image

Images:

Allanite-(Ce)

Comments: Dual views of the same 0.8 cm Jet black allanite-(Ce) on quartz.
Location: Tiro Estrella Mine, El Capitan Mts., Lincoln Co., New Mexico, USA. Scale: Crystal Size 0.8 cm.
© John Veevaert

Allanite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.5617:1:1.7791

Cell Dimensions:

a = 8.98, b = 5.75, c = 10.23, Z = 2; beta = 115° V = 478.74 Den(Calc)= 4.26

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.92(1), 2.714(0.65), 3.53(0.45),

Physical Properties of Allanite-(Ce)

Cleavage:

{001} Imperfect, {100} Imperfect

Color:

Brown, Reddish brown, Black.

Density:

3.3 - 4.2, Average = 3.75

Diaphaneity:

Translucent to opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

grayish brown

Optical Properties of Allanite-(Ce)

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1797,KPDmeas= 0.2042,KC= 0.2023
Ncalc = 1.67 - 1.86

Optical Data:

Biaxial (-), a=1.715-1.791, b=1.718-1.815, g=1.733-1.822, bire=0.0180-0.0310, 2V(Calc)=50-56, 2V(Meas)=40-80. Dispersion distinct to strong, r > v.

Pleochroism (x):

colorless, pale yellow, yellowish brown, pink, or greenish yellow.

Pleochroism (y):

yellowish brown, reddish brown, brownish green, dark reddish brown, or greenish brown.

Pleochroism (z):

pale yellow, brownish yellow, brownish green, green, or brown.

Calculated Properties of Allanite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.53 gm/cc
note: Specific Gravity of Allanite-(Ce) =3.75 gm/cc.

Fermion Index:

Fermion Index = 0.0080610717
Boson Index = 0.9919389283

Photoelectric:

PE_{Allanite-(Ce)}= 143.16 barns/electron
U=PE_{Allanite-(Ce)} x r_electron= 504.87 barns/cc.

Radioactivity:

GRapi = 27,438.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Allanite-(Ce) per GRapi unit = 36.45 (PPM)

Allanite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Allanite-(Ce)** - 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 / 7.99 cm	612,697	1.66E-05	27,438.56	9.02
100 gm / 3.71 cm	61,270	1.66E-06	2,743.86	0.90
10 gm / 1.72 cm	6,127	1.66E-07	274.39	0.09
1 gm / 7.99 mm	613	1.66E-08	27.44	0.01
0.1 gm / 3.71 mm	61	1.66E-09	2.74	0.00
0.01 gm / 1.72 mm	6	1.66E-10	0.27	0.00
0.001 gm / 0.80 mm	1	1.66E-11	0.03	0.00

Weight of pure Allanite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.75 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 ( 1.37 % Th) From Sum REE Elements (27.35 % REE)

Allanite-(Ce) Classification

Dana Class:

58.02.01c.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.02.01c)Epidote group (Allanite subgroup)

58.02.01c.01 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.02.01c.02 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01c.03 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.02.01c.04 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

58.02.01c.05 Dissakisite-(La)! (Ca,Fe,Th,La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

58.02.01c.06 Manganiandrosite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.02.01c.07 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

58.02.01c.08 Vastmanlandite-(Ce)! (Ce,La)3CaAl2Mg2[Si2O7][SiO4]3F(OH)2 P 2₁/m 2/m

58.02.01c.09 Manganiandrosite-(Ce)! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.02.01c.10 Vanadoandrosite-(Ce)! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

09.BG.05b 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.05b Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05b Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

09.BG.05b Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

09.BG.05b Manganiandrosite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

09.BG.05b Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

09.BG.05b Manganiandrosite-(Ce)! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

09.BG.05b Vanadoandrosite-(Ce)! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

09.BG.05b Dissakisite-(La)! (Ca,Fe,Th,La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

09.BG.05b Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

09.BG.05b Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Other Allanite-(Ce) Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Allanite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Scandinavian mineral gallery

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Allanite-(Ce)

(Ce,Ca,Y)2(Al,Fe+++)3(SiO4)3(OH)
Dana No: 58.02.01c.01 Strunz No: 09.BG.05b
Locality:

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