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Allanite-(La) Mineral Data

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General Allanite-(La) Information

Help on Chemical  Formula: Chemical Formula: Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)
Help on Composition: Composition: Molecular Weight = 557.74 gm
   Calcium         9.19 %  Ca   12.86 % CaO
   Lanthanum       7.17 %  La    8.41 % La2O3
   Cerium          5.18 %  Ce    6.06 % Ce2O3
   Praeseodymium   2.68 %  Pr    3.13 % Pr2O3
   Yttrium         0.02 %  Y     0.02 % Y2O3
   Thorium         0.25 %  Th    0.28 % ThO2
   Magnesium       0.19 %  Mg    0.32 % MgO
   Titanium        0.06 %  Ti    0.10 % TiO2
   Aluminum        9.29 %  Al   17.56 % Al2O3
   Iron           10.50 %  Fe    8.50 % FeO /  5.30 % Fe2O3
   Silicon        15.00 %  Si   32.08 % SiO2
   Hydrogen        0.18 %  H     1.62 % H2O
   Neodymium       3.00 %  Nd    3.50 % Nd2O3
   Oxygen         37.29 %  O
                 ______        ______ 
                 100.00 %       99.74 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaLa0.28Ce0.2Nd0.11Pr0.1Y0.001Ca0.27Th0.006Al0.89Fe3+0.1AlFe2+0.66Fe3+0.27Mg0.04 Ti0.007Si0.97Al0.02O4(Si2O7)O(OH)
Help on Environment: Environment: Found in close association with calcite and barite in barite veins that cut a dolomitic metamorphosed limestone. Epidote group.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Buca della Vena Mine, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Scottish mineralogist, T. Allan (1777-1833) and the La content.
Help on Name Pronunciation: Name Pronunciation: Allanite-(La) Say ALLANITE-(LA)
Help on Synonym: Synonym: IMA2003-065
 

Allanite-(La) Image

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  Allanite-(La)

Comments: A single prismatic allanite-(La) crystal with small, lustrous black magnetite crystals, all on a matrix of hedenbergite.
Location: Mina Nueva Vizcaya, Sierra Gorda, Burguillos del Cerro, Badajoz, Spain. Scale: Crystal size 0.9 x 0.5 cm.
© Fabre Minerals

Allanite-(La) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5567:1:1.7694
Help on Cell Dimensions: Cell Dimensions: a = 8.914, b = 5.726, c = 10.132, Z = 2; beta = 114.87° V = 469.19 Den(Calc)= 3.95
Help on Crystal System: 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/Io): 2.901(1)(113), 2.692(0.6)(013 ), 2.611(0.5)(311), 2.806(0.4)(020 ), 2.174(0.25)(401), 1.632(0.2)(233), 3.506(0.2)(211), 1.432(0
 

Physical Properties of Allanite-(La)

Help on Color: Color: Brown, Black.
Help on Density: Density: 3.93
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Radioactive and Non-Fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: grayish brown
 

Optical Properties of Allanite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1924,KPDmeas= 0.1934,KC= 0.2002
Ncalc = 1.79
Help on Optical Data: Optical Data: Biaxial (-), a=1.755, b=1.76, g=1.765, bire=0.0100
 

Calculated Properties of Allanite-(La)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.77 gm/cc
note: Specific Gravity of Allanite-(La) =3.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAllanite-(La) = 98.10 barns/electron
U=PEAllanite-(La) x relectron= 369.64 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5,105.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Allanite-(La) per GRapi unit = 195.87 (PPM)

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

Estimated Radioactivity from Allanite-(La) - mild
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 / 7.86 cm 111,830 3.02E-06 5,105.45 1.68
100 gm / 3.65 cm 11,183 3.02E-07 510.54 0.17
10 gm / 1.69 cm 1,118 3.02E-08 51.05 0.02
1 gm / 7.86 mm 112 3.02E-09 5.11 0.00
0.1 gm / 3.65 mm 11 3.02E-10 0.51 0.00
0.01 gm / 1.69 mm 1 3.02E-11 0.05 0.00
0.001 gm / 0.79 mm 0 3.02E-12 0.01 0.00

Weight of pure Allanite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.93 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
 

Allanite-(La) Classification

Help on  Dana Class: Dana Class: 58.02.01c.02 (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-(La) Information

Help on References: References: NAME( AmMin, v91, p1945) PHYS. PROP.(AmMin, v91, p1945) OPTIC PROP.(AmMin, v91, p1945)
Help on See Also: See Also: Links to other databases for Allanite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Allanite-(La)

Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)
Dana No: 58.02.01c.02 Strunz No: 09.BG.05b
Locality:

 

Notes:

 

 
   
 


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