Gatelite-(Ce) Mineral Data (original) (raw)

General Gatelite-(Ce) Information

Chemical Formula:

(Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3

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

Empirical Formula:

Ca1.1Ce1.4La0.5Nd0.8Pr0.1Sm0.1Al3.1Mg0.5Fe2+0.3Si5.1O20.3(OH)1.6F0.3

Environment:

Found as a late-stage mineral in the dolomitic levels of the Trimmouns Talc deposit intergrown with tornebohmite-(Ce). (related to epidote; structure)

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Trimouns talc deposit, Luzenac, Ariege, French Pyrenees, France. Link to MinDat.org Location Data.

Name Origin:

Named for Pierre Gatel, French mineral collector and founder of the Association Francaise de Micromineralogie.

Synonym:

IMA2001-050

Gatelite-(Ce) Image

Images:

Gatelite-(Ce) Crystallography

Axial Ratios:

a:b:c =3.1445:1:3.0893

Cell Dimensions:

a = 17.77, b = 5.651, c = 17.458, Z = 4; beta = 116.18° V = 1,573.26 Den(Calc)= 4.51

Crystal System:

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

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

| | 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)

Cleavage:

{100} Good, {001} Imperfect

Color:

Colorless.

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gatelite-(Ce)

Optical Data:

Biaxial (?)

NCalc= 1.81 - from Gladstone-Dale relationship (KC = 0.1787) where Ncalc=Dcalc*KC+1

Calculated Properties of Gatelite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Gatelite-(Ce) =4.51 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

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

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

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

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

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

References:

NAME( AmMin, Vol 88, p 223) PHYS. PROP.(AmMin, Vol 88, p 223)

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

Search for Gatelite-(Ce) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Gatelite-(Ce) :

A Bijoux Google Search for Gatelite-(Ce)
Adam's Minerals Google Search for Gatelite-(Ce)
Cape Minerals Google Search for Gatelite-(Ce)
Dakota Matrix Minerals Google Search for Gatelite-(Ce)
Excalibur Mineral Corp. Google Search for Gatelite-(Ce)
Exceptional Minerals Google Search for Gatelite-(Ce)
John Betts Fine Minerals Search for Gatelite-(Ce)
McDougall Minerals Google Search for Gatelite-(Ce)
Mineral News Website Link
Rock and Mineral Shows Google Search for Gatelite-(Ce)
Weinrich Minerals, Inc. Google Search for Gatelite-(Ce)

Ask about Gatelite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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:

Notes: