Synchysite-(Ce) Mineral Data

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.

Name Pronunciation:

Synchysite-(Ce) + Pronunciation

Synonym:

ICSD 79161

PDF 33-1438

Synchysite-(Ce) Image

Images:

Cordylite-(Ce) Synchysite-(Ce)

Comments: Yellow crystals of cordylite-(Ce) on light brownish synchysite-(Ce).
Location: NarssÃ¢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 - Prismatic H-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),

Physical Properties of Synchysite-(Ce)

Cleavage:

{0001} Indistinct

Color:

Brown, Gray, Grayish yellow, Orange.

Density:

3.902 - 4.15, Average = 4.02

Diaphaneity:

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
Ncalc = 1.67 - 1.71

Optical Data:

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

Calculated Properties of Synchysite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.71 gm/cc
note: Specific Gravity of Synchysite-(Ce) =4.03 gm/cc.

Fermion Index:

Fermion Index = 0.0011416491
Boson Index = 0.9988583509

Photoelectric:

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

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

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

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

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 - 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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Synchysite-(Ce)

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

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