Gatelite-(Ce) Mineral Data


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General Gatelite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3
Help on Composition: Composition: Molecular Weight = 1,067.70 gm
   Calcium         4.13 %  Ca    5.78 % CaO
   Lanthanum       6.50 %  La    7.63 % La2O3
   Cerium         18.37 %  Ce   21.52 % Ce2O3
   Praeseodymium   1.32 %  Pr    1.54 % Pr2O3
   Samarium        1.41 %  Sm    1.63 % Sm2O3
   Magnesium       1.14 %  Mg    1.89 % MgO
   Aluminum        7.83 %  Al   14.80 % Al2O3
   Iron            1.57 %  Fe    2.02 % FeO
   Silicon        13.42 %  Si   28.70 % SiO2
   Hydrogen        0.15 %  H     1.35 % H2O
   Neodymium      10.81 %  Nd   12.61 % Nd2O3
   Oxygen         32.82 %  O
   Fluorine        0.53 %  F     0.53 % F
                    -   %   F    -0.22 % -O=F2
                 ______        ______ 
                 100.00 %       99.78 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.1Ce1.4La0.5Nd0.8Pr0.1Sm0.1Al3.1Mg0.5Fe2+0.3Si5.1O20.3(OH)1.6F0.3
Help on Environment: Environment: Found as a late-stage mineral in the dolomitic levels of the Trimmouns Talc deposit intergrown with tornebohmite-(Ce). (related to epidote; structure)
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Trimouns talc deposit, Luzenac, Ariege, French Pyrenees, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Gatel, French mineral collector and founder of the Association Francaise de Micromineralogie.
Help on Synonym: Synonym: IMA2001-050
 

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Gatelite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.1445:1:3.0893
Help on Cell Dimensions: Cell Dimensions: a = 17.77, b = 5.651, c = 17.458, Z = 4; beta = 116.18° V = 1,573.26 Den(Calc)= 4.51
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.967(1)(215), 15.667(0.87)(001), 2.61(0.56)(612),3.486(0.5)(412), 2.826(0.44)(020), 4.611(0.33)(210), 2.74(0.32)(015), 7.974(0.27)(200), 2.654(0.26)(403),
Click Here for Large Gatelite-(Ce) Structure Window Crystal Structure:

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Bonazzi P , Bindi L , Parodi G C , American Mineralogist , 88 (2003) p.223-228, Gatelite-(Ce), a new REE-bearing mineral from Trimouns, French Pyrenees:, Crystal structure and polysomatic relationships with epidote and, tornebohmite-(Ce)

 

Physical Properties of Gatelite-(Ce)

Help on Cleavage: Cleavage: [100] Good, [001] Imperfect
Help on Color: Color: Colorless.
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Gatelite-(Ce)

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 1.81 - from Gladstone-Dale relationship (KC = 0.1787) where Ncalc=Dcalc*KC+1
 

Calculated Properties of Gatelite-(Ce)

Help on Electron Density: Electron Density:

relectron=4.20 gm/cc
note: rGatelite-(Ce) =4.51 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03419
Boson Index = 0.96581
Help on Photoelectric: Photoelectric:

PEGatelite-(Ce) = 199.82 barns/electron
U=PEGatelite-(Ce) x relectron= 838.62 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 38,208.92 (Gamma Ray American Petroleum Institute Units)

Gatelite-(Ce) 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) 796.06 ±199.02 grams of pure Gatelite-(Ce) .

Estimated Radioactivity from Gatelite-(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 / 7.51 cm 862,230 2.33E-05 38,208.92 12.56
100 gm / 3.49 cm 86,223 2.33E-06 3,820.89 1.26
10 gm / 1.62 cm 8,622 2.33E-07 382.09 0.13
1 gm / 7.51 mm 862 2.33E-08 38.21 0.01
0.1 gm / 3.49 mm 86 2.33E-09 3.82 0.00
0.01 gm / 1.62 mm 9 2.33E-10 0.38 0.00
0.001 gm / 0.75 mm 1 2.33E-11 0.04 0.00

Weight of pure Gatelite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.51 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 ( 1.92 % Th) From Sum REE Elements (38.41 % REE)
 

Gatelite-(Ce) Classification

Help on  Dana Class: Dana Class: 58.2.1a.16 (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
Help on  Strunz Class: Strunz Class: VIII/C.23-87 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 Gatelite-(Ce) Information

Help on References: References: NAME( AmMin, Vol 88, p 223) PHYS. PROP.(AmMin, Vol 88, p 223)
Help on See Also: See Also: Links to other databases for Gatelite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Gatelite-(Ce) Specimen Label here :

Gatelite-(Ce)

(Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3
Dana No: 58.2.1a.16 Strunz No: VIII/C.23-87
Locality:

 

Notes:

 

 
   
 
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