Bastnasite-(Ce) Mineral Data

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General Bastnasite-(Ce) Information

Chemical Formula:

Ce(CO3)F

Composition:

Molecular Weight = 219.12 gm

Cerium 63.94 % Ce 74.90 % Ce₂O₃

Carbon 5.48 % C 20.08 % CO₂

Oxygen 21.90 % O

Fluorine 8.67 % F 8.67 % F

- % F -3.65 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce(CO₃)F

Environment:

Contact or alteration zones in alkalic rocks.

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Bastnas Mine, Riddarhyttan district, Vastermanland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Bastnasite-(Ce) + Pronunciation

Synonym:

Hamartite

Bastnasite-(Ce) Image

Images:

Bastnasite-(Ce)

Comments: Platy crystal of bastnäsite-(Ce).
Location: Trimouns, Luzenac, Ariège, France. Scale: 0.8 cm.
© John Veevaert

Bastnasite-(Ce) Crystallography

Axial Ratios:

a:c = 1:1.36731

Cell Dimensions:

a = 7.16, c = 9.79, Z = 6; V = 434.65 Den(Calc)= 5.02

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 62c

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

By Intensity(I/I_o): 2.879(1), 3.564(0.7), 4.88(0.4),

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

Physical Properties of Bastnasite-(Ce)

Cleavage:

{1011} Imperfect, {0001} Indistinct

Color:

Yellow, Reddish brown.

Density:

4.95 - 5, Average = 4.97

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

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

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Bastnasite-(Ce)

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1529,KPDmeas= 0.1543,KC= 0.1543
Ncalc = 1.76 - 1.77

Optical Data:

Uniaxial (+), w=1.717, e=1.818, bire=0.1010.

Calculated Properties of Bastnasite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.40 gm/cc
note: Specific Gravity of Bastnasite-(Ce) =4.98 gm/cc.

Fermion Index:

Fermion Index = 0.0007080974
Boson Index = 0.9992919026

Photoelectric:

PE_{Bastnasite-(Ce)}= 333.56 barns/electron
U=PE_{Bastnasite-(Ce)} x r_electron=1,469.21 barns/cc.

Radioactivity:

GRapi = 60,386.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Bastnasite-(Ce) per GRapi unit = 16.56 (PPM)

Bastnasite-(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) 503.70 ±125.92 grams of pure Bastnasite-(Ce) .

**Estimated Radioactivity from Bastnasite-(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 / 7.27 cm	1,432,338	3.87E-05	60,386.63	19.85
100 gm / 3.37 cm	143,234	3.87E-06	6,038.66	1.99
10 gm / 1.57 cm	14,323	3.87E-07	603.87	0.20
1 gm / 7.27 mm	1,432	3.87E-08	60.39	0.02
0.1 gm / 3.37 mm	143	3.87E-09	6.04	0.00
0.01 gm / 1.57 mm	14	3.87E-10	0.60	0.00
0.001 gm / 0.73 mm	1	3.87E-11	0.06	0.00

Weight of pure Bastnasite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.98 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 ( 3.20 % Th) From Sum REE Elements (63.94 % REE)

Bastnasite-(Ce) Classification

Dana Class:

16a.01.01.01 (16a)Carbonates - Hydroxyl or Halogen

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

(16a.01.01)Bastnasite Subgroup

16a.01.01.01 Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2

16a.01.01.02 Bastnasite-(La) La(CO3)F P 62c 6 m2

16a.01.01.03 Bastnasite-(Y) Y(CO3)F P 62c 6 m2

Strunz Class:

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

05.B - Carbonates with additional anions, without H2O

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

05.BD.20a Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2

05.BD.20a Bastnasite-(La) La(CO3)F P 62c 6 m2

05.BD.20a Bastnasite-(Y) Y(CO3)F P 62c 6 m2

05.BD.20a Hydroxylbastnasite-(Ce) Ce(CO3)(OH) P 62c 6 m2

05.BD.20a Hydroxylbastnasite-(La) La(CO3)(OH) C 222₁ 2 2 2

05.BD.20a Hydroxylbastnasite-(Nd) Nd(CO3)(OH) P 62c 6 m2

05.BD.20a Thorbastnasite Th(Ca,Ce)(CO3)2F2•3(H2O) P 62c 6 m2

Other Bastnasite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Bastnasite-(Ce) :
1 - Alkali-Nuts(English)
2 - Am. Min. Crystal Structure Database
3 - Athena
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
13 - Scandinavian mineral gallery
14 - WWW-MINCRYST

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

Bastnasite-(Ce)

Ce(CO3)F
Dana No: 16a.01.01.01 Strunz No: 05.BD.20a
Locality:

Notes: