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Synchysite-(Ce) Mineral Data

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General Synchysite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: CaCe(CO3)2F
Help on Composition: Composition: Molecular Weight = 319.21 gm
   Calcium   12.56 %  Ca   17.57 % CaO
   Cerium    43.89 %  Ce   51.41 % Ce2O3
   Carbon     7.53 %  C    27.57 % CO2
   Oxygen    30.07 %  O
   Fluorine   5.95 %  F     5.95 % F
               -   %   F    -2.51 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaCe(CO3)2F
Help on Environment: Environment: Found with parisite in REE-bearing pegmatites and alpine veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1901
Help on Locality: Locality: Narssarssuk, Julianehaab district, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for "confounding" having been mistaken for parisite and for the Ce end-member of the series.
Help on Name Pronunciation: Name Pronunciation: Synchysite-(Ce) + Pronunciation Say SYNCHYSITE-(CE)
Help on Synonym: Synonym: ICSD 79161
  PDF 33-1438
 

Synchysite-(Ce) Image

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  Cordylite-(Ce)   Synchysite-(Ce)

Comments: Yellow crystals of cordylite-(Ce) on light brownish synchysite-(Ce).
Location: Narssârssuk (Narsarsuk), Igaliko, Greenland. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

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  Synchysite-(Ce)

Comments: Prismatic crystals of synchysite-(Ce) on matrix.
Location: Kaiserer quarry, Raurisertal, Salzburg, Austria. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Synchysite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.734:1:2.6358
Help on Cell Dimensions: Cell Dimensions: a = 12.329, b = 7.11, c = 18.741, Z = 12; beta = 102.68° V = 1,602.75 Den(Calc)= 3.97
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.8(1), 3.55(1), 9.1(0.6),
 

Physical Properties of Synchysite-(Ce)

Help on Cleavage: Cleavage: {0001} Indistinct
Help on Color: Color: Brown, Gray, Grayish yellow, Orange.
Help on Density: Density: 3.902 - 4.15, Average = 4.02
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Pseudo Rhombohedral - Crystals show a rhombohedral outline.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Synchysite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1819,KPDmeas= 0.1793,KC= 0.1719
Ncalc = 1.67 - 1.71
Help on Optical Data: Optical Data: Uniaxial (+), w=1.674, e=1.77, bire=0.0960.
 

Calculated Properties of Synchysite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.71 gm/cc
note: Specific Gravity of Synchysite-(Ce) =4.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0011416491
Boson Index = 0.9988583509
Help on Photoelectric: Photoelectric: PESynchysite-(Ce) = 221.83 barns/electron
U=PESynchysite-(Ce) x relectron= 822.54 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 43,122.93 (Gamma Ray American Petroleum Institute Units)
Concentration of Synchysite-(Ce) per GRapi unit = 23.19 (PPM)

Synchysite-(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) 705.35 ±176.34 grams of pure Synchysite-(Ce) .

Estimated Radioactivity from Synchysite-(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 / 7.80 cm 983,233 2.66E-05 43,122.93 14.18
100 gm / 3.62 cm 98,323 2.66E-06 4,312.29 1.42
10 gm / 1.68 cm 9,832 2.66E-07 431.23 0.14
1 gm / 7.80 mm 983 2.66E-08 43.12 0.01
0.1 gm / 3.62 mm 98 2.66E-09 4.31 0.00
0.01 gm / 1.68 mm 10 2.66E-10 0.43 0.00
0.001 gm / 0.78 mm 1 2.66E-11 0.04 0.00

Weight of pure Synchysite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.03 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 ( 2.19 % Th) From Sum REE Elements (43.89 % REE)
 

Synchysite-(Ce) Classification

Help on  Dana Class: Dana Class: 16a.01.03.01 (16a)Carbonates - Hydroxyl or Halogen
  (16a.01)in the Bastnasite/Shynchysite/Parasite Groups
  (16a.01.03)Synchysite Subgroup
 
16a.01.03.01 Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m
 
16a.01.03.02 Synchysite-(Y) CaY(CO3)2F C 2/c 2/m
 
16a.01.03.03 Synchysite-(Nd) CaNd(CO3)2F Unk Ortho
Help on  Strunz Class: Strunz Class: 05.BD.20c 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BD -With rare-earth elements (REE)
 
05.BD.20c Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m
 
05.BD.20c Synchysite-(Nd) CaNd(CO3)2F Unk Ortho
 
05.BD.20c Synchysite-(Y) CaY(CO3)2F C 2/c 2/m
 

Other Synchysite-(Ce) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Synchysite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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

Synchysite-(Ce)

CaCe(CO3)2F
Dana No: 16a.01.03.01 Strunz No: 05.BD.20c
Locality:

 

Notes:

 

 
   
 


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