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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
 

Gatelite-(Ce) Image

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  Gatelite-(Ce)

Comments: B&W image of crystals of gatelite-(Ce). (AmMin, v88:223).
Location: Trimouns talc deposit, Luzenac, Ariege, French Pyrenees. Scale: Crystal Length 700 µm.
© R. Vernet / American Mineralogist

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 - Prismatic H-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),
 

Physical Properties of Gatelite-(Ce)

Help on Cleavage: Cleavage: {100} Good, {001} Imperfect
Help on Color: Color: Colorless.
Help on Diaphaneity: Diaphaneity: 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: Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Gatelite-(Ce) =4.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEGatelite-(Ce) = 199.82 barns/electron
U=PEGatelite-(Ce) x relectron= 838.62 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 38,208.99 (Gamma Ray American Petroleum Institute Units)
Concentration of Gatelite-(Ce) per GRapi unit = 26.17 (PPM)

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 862,231 2.33E-05 38,208.99 12.56
100 gm / 3.49 cm 86,223 2.33E-06 3,820.90 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: 58.02.01a.08 (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)
  (58.02.01a)Epidote group (Clinozoisite subgroup)
 
58.02.01a.01 Clinozoisite! Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.02 Epidote! Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.03 Epidote-(Pb)! (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.04 Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
 
58.02.01a.05 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.06 Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.02.01a.07 Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
 
58.02.01a.08 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 21/a 2/m
 
58.02.01a.09 Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
58.02.01a.10 Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
58.02.01a.11 Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
Help on Strunz Class: Strunz Class: 09.BG.50 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.50 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 21/a 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 58.02.01a.08 Strunz No: 09.BG.50
Locality:

 

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