Allanite-(Ce) Mineral Data

Allanite-(Ce) Mineral Data
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General Allanite-(Ce) Information

Help on Chemical Formula: Chemical Formula: (Ce,Ca,Y)2(Al,Fe+++)3(SiO4)3(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ce1.2Ca0.6Y0.3Al2.25Fe3+0.75(SiO4)3(OH)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1810 - Dana Number Modified from 58.2.1a.1
Help on Locality: Locality: Greenland, Qaqarssuatsiaq Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Scottish mineralogist, T. Allan (1777-1833).
Help on Name Pronunciation: Name Pronunciation: Allanite-(Ce) Say ALLANITE-(CE)
Help on Synonym: Synonym: ICSD 15190
  Orthite
  PDF 25-169
 

Allanite-(Ce) Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =1.5617:1:1.7791
Help on Cell Dimensions: Cell Dimensions: a = 8.98, b = 5.75, c = 10.23, Z = 2; beta = 115° V = 478.74 Den(Calc)= 4.26
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.92(1), 2.714(0.65), 3.53(0.45),
Click Here for Large Allanite-(Ce) Structure Window Crystal Structure:

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Dollase W A , American Mineralogist , 56 (1971) p.447-464, Refinement of the crystal structures of epidote, allanite and hancockite

 

Physical Properties of Allanite-(Ce)

Help on Cleavage: Cleavage: {001} Imperfect, {100} Imperfect
Help on Color: Color: Brown, Reddish brown, Black.
Help on Density: Density: 3.3 - 4.2, Average = 3.75
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: grayish brown
 

Optical Properties of Allanite-(Ce)

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless, pale yellow, yellowish brown, pink, or greenish yellow.
Help on Pleochroism (y): Pleochroism (y): yellowish brown, reddish brown, brownish green, dark reddish brown, or greenish brown.
Help on Pleochroism (z): Pleochroism (z): pale yellow, brownish yellow, brownish green, green, or brown.
 

Calculated Properties of Allanite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.53 gm/cc
note: Specific Gravity of Allanite-(Ce) =3.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080610717
Boson Index = 0.9919389283
Help on Photoelectric: Photoelectric: PEAllanite-(Ce) = 143.16 barns/electron
U=PEAllanite-(Ce) x relectron= 504.87 barns/cc.
Help on Radioactivity: 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
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Heinrich65)
Help on See Also: 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 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
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:

 

Notes: