Parisite-(Ce) Mineral Data

General Parisite-(Ce) Information

Chemical Formula:

Ca(Ce,La)2(CO3)3F2

Composition:

Molecular Weight = 537.24 gm

Calcium 7.46 % Ca 10.44 % CaO

Lanthanum 23.27 % La 27.29 % La₂O₃

Cerium 28.69 % Ce 33.60 % Ce₂O₃

Carbon 6.71 % C 24.58 % CO₂

Oxygen 26.80 % O

Fluorine 7.07 % F 7.07 % F

- % F -2.98 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCe_1.1La_0.9(CO₃)₃F₂

Environment:

In calcite veins in hydrothermal deposits.

IMA Status:

Valid Species (Pre-IMA) 1835

Locality:

Emerald mines, Muso, columbia. Link to MinDat.org Location Data.

Name Origin:

Named for J. J. Paris, mine proprietor at Muzo, north of Bogota, Columbia.

Name Pronunciation:

Parisite-(Ce)

Parisite-(Ce) Image

Images:

Parisite-(Ce)

Comments: Brown crystals of parisite-(Ce) in matrix.
Location: Narssarssuk, Igaliko, Greenland. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Parisite-(Ce)

Comments: Columnar, hexagonal crystal of orangy brown parisite-(Ce) on matrix.
Location: Somewhere near Boyaca, Colombia. Scale: Scale not given.
© Diego Rodriguez Acosta

Parisite-(Ce) Crystallography

Axial Ratios:

a:c = 1:1.96742

Cell Dimensions:

a = 7.1248, c = 14.0175, Z = 3; V = 616.24 Den(Calc)= 4.34

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.562(1), 2.833(0.8), 4.673(0.55),

Forms:

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Forms: ( 1 1 1) ( 1 0 1) ( 0 0 1)

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Crystal Structure:

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Donnay G , Donnay J D H , American Mineralogist , 38 (1953) p.932-963, The crystallography of bastnaesite, parasite, roentgenite, and synchisite

View Additional jPOWD Structure files for Parisite-(Ce)
[1]

Physical Properties of Parisite-(Ce)

Cleavage:

{0001} Distinct

Color:

Brown, Brownish yellow, Grayish yellow, Yellow.

Density:

4.36

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Parisite-(Ce)

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1651,KPDmeas= 0.1643,KC= 0.1659
Ncalc = 1.72

Optical Data:

Uniaxial (+), w=1.676, e=1.757, bire=0.0810.

Calculated Properties of Parisite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Parisite-(Ce) =4.34 gm/cc.

Fermion Index:

Fermion Index = 0.0011765591
Boson Index = 0.9988234409

Photoelectric:

PE_{Parisite-(Ce)}= 258.03 barns/electron
U=PE_{Parisite-(Ce)} x r_electron=1,013.44 barns/cc.

Radioactivity:

GRapi = 50,156.24 (Gamma Ray American Petroleum Institute Units)
Concentration of Parisite-(Ce) per GRapi unit = 19.94 (PPM)

Parisite-(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) 606.44 ±151.61 grams of pure Parisite-(Ce) .

**Estimated Radioactivity from Parisite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.61 cm	1,163,860	3.15E-05	50,156.24	16.49
100 gm / 3.53 cm	116,386	3.15E-06	5,015.62	1.65
10 gm / 1.64 cm	11,639	3.15E-07	501.56	0.16
1 gm / 7.61 mm	1,164	3.15E-08	50.16	0.02
0.1 gm / 3.53 mm	116	3.15E-09	5.02	0.00
0.01 gm / 1.64 mm	12	3.15E-10	0.50	0.00
0.001 gm / 0.76 mm	1	3.15E-11	0.05	0.00

Weight of pure Parisite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.34 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 ( 2.60 % Th) From Sum REE Elements (51.96 % REE)

Parisite-(Ce) Classification

Dana Class:

16a.01.05.01 (16a)Carbonates - Hydroxyl or Halogen

(16a.01)in the Bastnasite/Shynchysite/Parasite Groups

(16a.01.05)Parisite Subgroup

16a.01.05.01 Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3

16a.01.05.02 Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3

Strunz Class:

05.BD.20b 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BD -With rare-earth elements (REE)

05.BD.20b Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3

05.BD.20b Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3

Other Parisite-(Ce) Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Parisite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Parisite-(Ce) Specimen Label here :

Parisite-(Ce)

Ca(Ce,La)2(CO3)3F2
Dana No: 16a.01.05.01 Strunz No: 05.BD.20b
Locality:

Notes: