Synchysite-(Ce) Mineral Data

Synchysite-(Ce) Mineral Data +

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General Synchysite-(Ce) Information

Chemical Formula:

CaCe(CO3)2F

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

Empirical Formula:

CaCe(CO₃)₂F

Environment:

Found with parisite in REE-bearing pegmatites and alpine veins.

IMA Status:

Valid Species (Pre-IMA) 1901

Locality:

Narssarssuk, Julianehaab district, Greenland. Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

ICSD 79161

PDF 33-1438

Synchysite-(Ce) Image

Images:

Click Here for Larger Synchysite-(Ce) Image

Synchysite-(Ce) Cordylite-(Ce)

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

Images:

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

Axial Ratios:

a:b:c =1.734:1:2.6358

Cell Dimensions:

a = 12.329, b = 7.11, c = 18.741, Z = 12; beta = 102.68° V = 1,602.75 Den(Calc)= 3.97

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): 2.8(1), 3.55(1), 9.1(0.6),

Crystal Structure:

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Wang L , Ni Y , Hughes J M , Bayliss P , Drexler J W , The Canadian Mineralogist , 32 (1994) p.865-871, The atomic arrangement of synchysite-(Ce), CeCaF(CO3)2, Locality: Mont Saint-Hilaire, Quebec, Canada

Physical Properties of Synchysite-(Ce)

Cleavage:

[0001] Indistinct

Color:

Brown, Gray, Grayish yellow, Orange.

Density:

3.902 - 4.15, Average = 4.02

Diaphaniety:

Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Pseudo Rhombohedral - Crystals show a rhombohedral outline.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Synchysite-(Ce)

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

Optical Data:

Uniaxial (+), w=1.674, e=1.77, bire=0.0960.

Calculated Properties of Synchysite-(Ce)

Electron Density:

r_electron=3.71 gm/cc
note: r_{Synchysite-(Ce)}=4.03 gm/cc.

Fermion Index

Fermion Index = 0.00114
Boson Index = 0.99886

Photoelectric:

PE_{Synchysite-(Ce)}= 221.83 barns/electron
U=PE_{Synchysite-(Ce)} x r_electron= 822.54 barns/cc.

Radioactivity:

GRapi = 43,122.91 (Gamma Ray American Petroleum Institute Units)

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	43,122.91	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

Dana Class:

16a.1.3.1 (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.07-110 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-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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 - Crocoite.com Mineral Locations 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas

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Synchysite-(Ce)

CaCe(CO3)2F
Dana No: 16a.1.3.1 Strunz No: V/C.07-110
Locality:

Notes: