Synchysite-(Y) Mineral Data

General Synchysite-(Y) Information

Chemical Formula:

CaY(CO3)2F

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

Empirical Formula:

CaY(CO₃)₂F

Environment:

REE-bearing pegmatites.

IMA Status:

Approved IMA 1966

Locality:

Scrub Oaks mine, Dover, Morris County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the Y end-member of the Synchysite-(Ce) series.

Name Pronunciation:

Synchysite-(Y) + Pronunciation

Synonym:

Doverite

Synchysite-(Y) Image

Images:

Synchysite-(Y)

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

Axial Ratios:

a:b:c =1.7297:1:2.6488

Cell Dimensions:

a = 12.039, b = 6.96, c = 18.436, Z = 12; beta = 102.45° V = 1,508.45 Den(Calc)= 3.54

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/I_o): 1.89(1), 1.83(0.9), 2(0.9),

Physical Properties of Synchysite-(Y)

Cleavage:

{0001} Distinct

Color:

Reddish brown.

Density:

3.89 - 4.1, Average = 3.99

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Earthy (Dull)

Streak:

brown

Optical Properties of Synchysite-(Y)

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

Optical Data:

Biaxial (?), a=1.653, g=1.73, bire=0.0770

Calculated Properties of Synchysite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Synchysite-(Y) =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.0013597936
Boson Index = 0.9986402064

Photoelectric:

PE_{Synchysite-(Y)}= 42.82 barns/electron
U=PE_{Synchysite-(Y)} x rElectron Density= 144.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Synchysite-(Y) is Not Radioactive

Synchysite-(Y) Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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

Synchysite-(Y)

CaY(CO3)2F
Dana No: 16a.01.03.02 Strunz No: 05.BD.20c
Locality:

Notes:

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