Mineralogy Database

Yttrocerite Mineral Data

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General Yttrocerite Information

Help on Chemical  Formula: Chemical Formula: CaF2 + (Y,Ce)F3
Help on Composition: Composition: Molecular Weight = 236.78 gm
   Calcium   16.93 %  Ca   23.68 % CaO
   Cerium    14.79 %  Ce   17.33 % Ce2O3
   Yttrium   28.16 %  Y    35.76 % Y2O3
   Fluorine  40.12 %  F    40.12 % F
               -   %   F   -16.89 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaY0.75Ce0.25F5
Help on Environment: Environment: Y - rich fluorite.
Help on IMA Status: IMA Status: Not Approved IMA
Help on Locality: Locality: Falun, Sweden, Sussex Co., New Jersey. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from its chemical composition containing ytterbium (Named after Ytterby, Sweden) and cerium (Named after the asteroid, Ceres)..

Yttrocerite Image

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Comments: Blue/purpley Yttrocerite in matrix.
Location: Rockport Granite Company quarry, Rockport, Essex Co., Massachusetts, USA. Scale: Specimen Size 6.9 x 3.7 x 1.8 cm.
© Rob Lavinsky

Yttrocerite Crystallography

Help on Crystal System: Crystal System: Isometric Space Group: Unk

Physical Properties of Yttrocerite

Help on Cleavage: Cleavage: {111} Perfect, {111} Perfect, [111} Perfect
Help on Color: Color: Reddish blue, Purplish gray, Brown.
Help on Density: Density: 3 - 4, Average = 3.5
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Yttrocerite

Help on Optical Data: Optical Data: Isotropic, n=1.43.

Calculated Properties of Yttrocerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Yttrocerite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002285063
Boson Index = 0.9997714937
Help on Photoelectric: Photoelectric: PEYttrocerite = 112.77 barns/electron
U=PEYttrocerite x relectron= 362.57 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 14,495.39 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrocerite per GRapi unit = 68.99 (PPM)

Yttrocerite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Yttrocerite - weak
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 8.17 cm 331,384 8.96E-06 14,495.39 4.77
100 gm / 3.79 cm 33,138 8.96E-07 1,449.54 0.48
10 gm / 1.76 cm 3,314 8.96E-08 144.95 0.05
1 gm / 8.17 mm 331 8.96E-09 14.50 0.00
0.1 gm / 3.79 mm 33 8.96E-10 1.45 0.00
0.01 gm / 1.76 mm 3 8.96E-11 0.14 0.00
0.001 gm / 0.82 mm 0 8.96E-12 0.01 0.00

Weight of pure Yttrocerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.50 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 ( 0.74 % Th) From Sum REE Elements (14.79 % REE)

Yttrocerite Classification

Help on  Dana Class: Dana Class: (09)Halide Minerals
  (09.00)Without Dana Classification Numbers
  (09.00.00)Fluoride, Anhydrous Boldyrevite? NaCaMgAl3F14•4(H2O) None IMA2008-032 CuCl2•2NH3 C mcm 2/m 2/m 2/m IMA2008-039 (NH4)3PbCl5 P nma 2/m 2/m 2/m Yttrocerite* CaF2(Y,Ce)F3 Unk Cubic
Help on  Strunz Class: Strunz Class: 03.XX.00 03 - Halogenides
  03.X - Unclassified Strunz Halogenides
  03.XX -Fluoride, Anhydrous
03.XX.00 Hydrophilite? CaCl2 Pnnm 2/m 2/m 2/m
03.XX.00 Hydromolysite? FeCl3•6(H2O) C 2/m 2/m
03.XX.00 Lorettoite? Pb7O6Cl2 pseudo-TET Ortho
03.XX.00 Yttrocerite* CaF2(Y,Ce)F3 Unk Cubic
03.XX.00 IMA2009-014 SrF2 F m3m 4/m 3 2/m
03.XX.00 IMA2009-015 NaSrCeF6 P 63/m 6/m

Other Yttrocerite Information

Help on References: References: NAME( Emsley91) PHYS. PROP.(Dana) OPTIC PROP.(Dana)
Help on See Also: See Also: Links to other databases for Yttrocerite :
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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CaF2 + (Y,Ce)F3
Dana No: Strunz No: 03.XX.00





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