Mineralogy Database

Synchysite-(Y) Mineral Data

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General Synchysite-(Y) Information

Help on Chemical  Formula: Chemical Formula: CaY(CO3)2F
Help on Composition: Composition: Molecular Weight = 268.00 gm
   Calcium   14.95 %  Ca   20.92 % CaO
   Yttrium   33.17 %  Y    42.13 % Y2O3
   Carbon     8.96 %  C    32.84 % CO2
   Oxygen    35.82 %  O
   Fluorine   7.09 %  F     7.09 % F
               -   %   F    -2.98 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaY(CO3)2F
Help on Environment: Environment: REE-bearing pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: Scrub Oaks mine, Dover, Morris County, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Y end-member of the Synchysite-(Ce) series.
Help on Name Pronunciation: Name Pronunciation: Synchysite-(Y) + Pronunciation Say SYNCHYSITE-(Y)
Help on Synonym: Synonym: Doverite

Synchysite-(Y) Image

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Comments: Small thin tabular crystals of synchysite-(Y) in a vug.
Location: Cuasso da Monte, Varese province, Lombardy, Italy. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Synchysite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7297:1:2.6488
Help on Cell Dimensions: Cell Dimensions: a = 12.039, b = 6.96, c = 18.436, Z = 12; beta = 102.45° V = 1,508.45 Den(Calc)= 3.54
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): 1.89(1), 1.83(0.9), 2(0.9),

Physical Properties of Synchysite-(Y)

Help on Cleavage: Cleavage: {0001} Distinct
Help on Color: Color: Reddish brown.
Help on Density: Density: 3.89 - 4.1, Average = 3.99
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: brown

Optical Properties of Synchysite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.08 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1953,KPDmeas= 0.1731,KC= 0.1882
Ncalc = 1.67 - 1.77
Help on Optical Data: Optical Data: Biaxial (?), a=1.653, g=1.73, bire=0.0770

Calculated Properties of Synchysite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Synchysite-(Y) =3.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013597936
Boson Index = 0.9986402064
Help on Photoelectric: Photoelectric: PESynchysite-(Y) = 42.82 barns/electron
U=PESynchysite-(Y) x rElectron Density= 144.79 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Synchysite-(Y) is Not Radioactive

Synchysite-(Y) Classification

Help on  Dana Class: Dana Class: 16a.01.03.02 (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-(Y) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Synchysite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: 16a.01.03.02 Strunz No: 05.BD.20c





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