Qaqarssukite-(Ce) Mineral Data

General Qaqarssukite-(Ce) Information

Chemical Formula:

Ba(Ce,REE)(CO3)2F

Composition:

Molecular Weight = 379.62 gm

Barium 24.60 % Ba 27.46 % BaO

Strontium 3.23 % Sr 3.82 % SrO

Calcium 2.01 % Ca 2.81 % CaO

Lanthanum 7.68 % La 9.01 % La₂O₃

Cerium 17.35 % Ce 20.32 % Ce₂O₃

Praeseodymium 1.48 % Pr 1.74 % Pr₂O₃

Samarium 0.40 % Sm 0.46 % Sm₂O₃

Titanium 0.88 % Ti 1.47 % TiO₂

Carbon 6.33 % C 23.19 % CO₂

Neodymium 5.70 % Nd 6.65 % Nd₂O₃

Oxygen 25.29 % O

Fluorine 5.05 % F 5.05 % F

- % F -2.13 % -O=F₂

______ ______

100.00 % 99.85 % = TOTAL OXIDE

Empirical Formula:

Ba_0.68Ca_0.19Sr_0.14Ce_0.47La_0.21Nd_0.15Pr_0.04Sm_0.01Ti_0.07(CO₃)₂F_1.01

Environment:

Found in the core of the intrusion, in the REE carbonatite as potential REE ore. Polymorph of huanghoite-(Ce).

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Qaqarssuk carbonatite complex, southern West Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2004-019

Qaqarssukite-(Ce) Image

Images:

Qaqarssukite-(Ce)

Comments: SEM image showing a blocky, stepped group of qaqarssukite-(Ce) crystals with several broken needles of strontianite. (CanMin, v44:1137).
Location: Qaqarssuk complex, Greenland. Scale: See Image.
© Canadian Mineralogist

Qaqarssukite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.52262

Cell Dimensions:

a = 7.2036, c = 18.172, Z = 6; V = 816.64 Den(Calc)= 4.63

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3c1

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

By Intensity(I/I_o): 5.14(0.28)(102), 4.55(0.43)(004), 3.671(0.32)(104),3.534(0.41)(111), 3.348(1)(112), 3.093(0.4)(113), 2.569(0.35)(204), 2.078(0.6)(300),

Physical Properties of Qaqarssukite-(Ce)

Cleavage:

None

Color:

Yellow brown.

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Adamantine - Greasy

Streak:

white

Optical Properties of Qaqarssukite-(Ce)

Gladstone-Dale:

CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1537,KC= 0.1584
Ncalc = 1.73

Optical Data:

Uniaxial (+), w=1.672, e=1.751, bire=0.0790.

Calculated Properties of Qaqarssukite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Qaqarssukite-(Ce) =4.63 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Qaqarssukite-(Ce)}= 286.54 barns/electron
U=PE_{Qaqarssukite-(Ce)} x r_electron=1,181.48 barns/cc.

Radioactivity:

GRapi = 31,000.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Qaqarssukite-(Ce) per GRapi unit = 32.26 (PPM)

Qaqarssukite-(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) 981.18 ±245.29 grams of pure Qaqarssukite-(Ce) .

**Estimated Radioactivity from Qaqarssukite-(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 / 7.44 cm	730,998	1.98E-05	31,000.20	10.19
100 gm / 3.46 cm	73,100	1.98E-06	3,100.02	1.02
10 gm / 1.60 cm	7,310	1.98E-07	310.00	0.10
1 gm / 7.44 mm	731	1.98E-08	31.00	0.01
0.1 gm / 3.46 mm	73	1.98E-09	3.10	0.00
0.01 gm / 1.60 mm	7	1.98E-10	0.31	0.00
0.001 gm / 0.74 mm	1	1.98E-11	0.03	0.00

Weight of pure Qaqarssukite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.63 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 ( 1.63 % Th) From Sum REE Elements (32.61 % REE)

Qaqarssukite-(Ce) Classification

Dana Class:

16a.01.04.02 (16a)Carbonates - Hydroxyl or Halogen

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

(16a.01.04)Dana Group

16a.01.04.01 Huanghoite-(Ce) BaCe(CO3)2F R 3m 3 2/m

16a.01.04.02 Qaqarssukite-(Ce)! Ba(Ce,REE)(CO3)2F P 3c1 3 2/m

Strunz Class:

05.BD.30 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

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

05.BD.30 Qaqarssukite-(Ce)! Ba(Ce,REE)(CO3)2F P 3c1 3 2/m

Other Qaqarssukite-(Ce) Information

References:

NAME( CanMin, v44:1137) PHYS. PROP.(CanMin, v44:1137) OPTIC PROP.(CanMin, v44:1137)

See Also:

Links to other databases for Qaqarssukite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Qaqarssukite-(Ce)

Ba(Ce,REE)(CO3)2F
Dana No: 16a.01.04.02 Strunz No: 05.BD.30
Locality:

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