Allanite-(La) Mineral Data

Allanite-(La) Mineral Data +

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General Allanite-(La) Information

Chemical Formula:

Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)

Composition:

Molecular Weight = 596.56 gm

Calcium 6.72 % Ca 9.40 % CaO

Lanthanum 17.46 % La 20.48 % La₂O₃

Cerium 5.87 % Ce 6.88 % Ce₂O₃

Manganese 2.30 % Mn 2.97 % MnO

Aluminum 6.78 % Al 12.82 % Al₂O₃

Iron 11.70 % Fe 9.03 % FeO / 6.69 % Fe₂O₃

Silicon 14.12 % Si 30.22 % SiO₂

Hydrogen 0.17 % H 1.51 % H₂O

Oxygen 34.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaLa_0.75Ce_0.25Fe²⁺_0.75Mn²⁺_0.25Al_1.5Fe³⁺_0.5(SiO₄)(Si₂O₇)O(OH)

Environment:

Epidote group

IMA Status:

Proposed IMA 2003 (Dana # Added)

Locality:

Buca della Vena Mine, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

IMA2003-065

Orthite

Allanite-(La) Image

Images:

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

Axial Ratios:

a:b:c =1.5567:1:1.7694

Cell Dimensions:

a = 8.914, b = 5.726, c = 10.132, Z = 2; beta = 114.87° V = 469.19 Den(Calc)= 4.22

Crystal System:

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

Crystal Structure:

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Orlandi P , Pasero M , The Canadian Mineralogist , 44 (2006) p.63-68, Allanite-(La) from Buca della Vena mine, Apuan Alps, Italy, an epidote-group mineral, Locality: Buca della Vena mine, near Stazzema, Apuan Alps, Tuscany, Italy

Physical Properties of Allanite-(La)

Color:

Brown, Black.

Diaphaniety:

Translucent to opaque

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

grayish brown

Optical Properties of Allanite-(La)

Optical Data:

Biaxial (-), a=1.755, b=1.76, g=1.765, bire=0.0100

Calculated Properties of Allanite-(La)

Electron Density:

r_electron=4.00 gm/cc
note: r_{Allanite-(La)}=4.22 gm/cc.

Fermion Index

Fermion Index = 0.00949
Boson Index = 0.99051

Photoelectric:

PE_{Allanite-(La)}= 113.73 barns/electron
U=PE_{Allanite-(La)} x r_electron= 454.54 barns/cc.

Radioactivity:

GRapi = 23,574.11 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Allanite-(La)** - 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 / 7.68 cm	522,708	1.41E-05	23,574.11	7.75
100 gm / 3.56 cm	52,271	1.41E-06	2,357.41	0.78
10 gm / 1.65 cm	5,227	1.41E-07	235.74	0.08
1 gm / 7.68 mm	523	1.41E-08	23.57	0.01
0.1 gm / 3.56 mm	52	1.41E-09	2.36	0.00
0.01 gm / 1.65 mm	5	1.41E-10	0.24	0.00
0.001 gm / 0.77 mm	1	1.41E-11	0.02	0.00

Weight of pure Allanite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.22 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 ( 1.17 % Th) From Sum REE Elements (23.34 % REE)

Allanite-(La) Classification

Dana Class:

58.2.1a.2 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

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

(58.2.1a)Epidote group (Epidote subgroup)

58.2.1a.1 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.2 Allanite-(La) ! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.3 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.4 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.5 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

58.2.1a.6 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

58.2.1a.7 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.8 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.9 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

58.2.1a.10 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

58.2.1a.11 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.12 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.13 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

58.2.1a.14 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

58.2.1a.15 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

58.2.1a.16 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

58.2.1a.17 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.18 Vastmanlandite-(Ce)! Ce3CaMg2Al2Si5O19(OH)2F P 2₁/m 2/m

58.2.1a.19 IMA2002-049! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

58.2.1a.20 Dissakisite-(La)! (Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 2₁/m 2/m

58.2.1a.22 IMA2004-015! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

Strunz Class:

VIII/C.23-65 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.23 - Epidote group

VIII/C.23-10 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-20 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-30 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-40 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-43 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 2₁/m 2/m

VIII/C.23-45 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 2₁/m 2/m

VIII/C.23-50 Mukhinite Ca2Al2V(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-52 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-55 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

VIII/C.23-58 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 2₁/m 2/m

VIII/C.23-60 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-65 Allanite-(La) Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-80 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 2₁/m 2/m

VIII/C.23-85a Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 2₁/m 2/m

VIII/C.23-85 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

VIII/C.23-87 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 2₁/a 2/m

VIII/C.23-90 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 2₁/m 2/m

VIII/C.23-100 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m

Other Allanite-(La) Information

See Also:

Links to other databases for Allanite-(La) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Allanite-(La)

Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)
Dana No: 58.2.1a.2 Strunz No: VIII/C.23-65
Locality:

Notes: