Synchysite-(Y) Mineral Data

Synchysite-(Y) Mineral Data +

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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 "confounding" having been mistaken for parisite and for the Y end-member of the series.

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 - PrismaticH-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

Optical Data:

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

Calculated Properties of Synchysite-(Y)

Electron Density:

r_electron=3.38 gm/cc
note: r_{Synchysite-(Y)}=3.54 gm/cc.

Fermion Index

Fermion Index = 0.00135
Boson Index = 0.99865

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Synchysite-(Y) is Not Radioactive

Synchysite-(Y) Classification

Dana Class:

16a.1.3.2 (16a)Carbonates - Hydroxyl or Halogen

(16a.1)in the Bastnasite/Shynchysite/Parasite Groups

(16a.1.3)Synchysite Subgroup

16a.1.3.1 Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m

16a.1.3.2 Synchysite-(Y) CaY(CO3)2F C 2/c 2/m

16a.1.3.3 Synchysite-(Nd) CaNd(CO3)2F Unk Ortho

Strunz Class:

V/C.07-100 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.07 - Bastnäsite-(Y) - Mineevite-(Y) series

V/C.07-10 Bastnasite-(Y) Y(CO3)F P 62c 6 m2

V/C.07-20 Bastnasite-(La) La(CO3)F P 62c 6 m2

V/C.07-30 Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2

V/C.07-40 Hydroxylbastnasite-(La) La(CO3)(OH) C 222₁ 2 2 2

V/C.07-50 Hydroxylbastnasite-(Ce) Ce(CO3)(OH) P 62c 6 m2

V/C.07-60 Hydroxylbastnasite-(Nd) Nd(CO3)(OH) P 62c 6 m2

V/C.07-61 Kozoite-(Nd)! (Nd,La,Sm,Pr)(CO3)(OH) Pmcn 2/m 2/m 2/m

V/C.07-62 Kozoite-(La)! La(CO3)(OH) Pmcn 2/m 2/m 2/m

V/C.07-64 Horvathite-(Y)! NaY(CO3)F2 Pmcn 2/m 2/m 2/m

V/C.07-70 Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3

V/C.07-80 Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3

V/C.07-90 Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3

V/C.07-100 Synchysite-(Y) CaY(CO3)2F C 2/c 2/m

V/C.07-110 Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m

V/C.07-120 Synchysite-(Nd) CaNd(CO3)2F Unk Ortho

V/C.07-130 Huanghoite-(Ce) BaCe(CO3)2F R 3m 3 2/m

V/C.07-140 Cebaite-(Ce) Ba3Ce2(CO3)5F2 C 2/m or C 2 Mono

V/C.07-150 Cebaite-(Nd)! Ba3(Nd,Ce)2(CO3)5F2 Unk Mono

V/C.07-154 Kukharenkoite-(La)! Ba2(La,Ce)(CO3)3F P 2₁/m 2/m

V/C.07-155 Kukharenkoite-(Ce)! Ba2Ce(CO3)3F P 2₁/m 2/m

V/C.07-160 Zhonghuacerite-(Ce) Ba2Ce(CO3)3F P 2₁/m 2/m

V/C.07-170 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 6₃/mmc 6/m 2/m 2/m

V/C.07-175 Lukechangite-(Ce)! Na3Ce2(CO3)4F P 6₃/mmc 6/m 2/m 2/m

V/C.07-190 Mineevite-(Y) Na25Ba(Y,Gd,Dy)2(HCO3)4(CO3)11(SO4)2ClF2 P 6₃/m 6/m

V/C.07-200 Reederite-(Y)! Na15Y2(CO3)9(SO3F)Cl P 6 6

V/C.07-210 Micheelsenite! (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O) P 6₃ 6

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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

Synchysite-(Y)

CaY(CO3)2F
Dana No: 16a.1.3.2 Strunz No: V/C.07-100
Locality:

Notes: