Calkinsite-(Ce) Mineral Data

General Calkinsite-(Ce) Information

Chemical Formula:

(Ce,La)2(CO3)3•4(H2O)

Composition:

Molecular Weight = 531.71 gm

Lanthanum 13.06 % La 15.32 % La₂O₃

Cerium 39.53 % Ce 46.30 % Ce₂O₃

Hydrogen 1.52 % H 13.55 % H₂O

Carbon 6.78 % C 24.83 % CO₂

Oxygen 39.12 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_1.5La_0.5(CO₃)₃•4(H₂O)

Environment:

Weathering product closely associated with burbankite.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Vermiculite prospects at the head of Big Sandy Creek, Rocky Boyï¿½s Indian Reservation, about 40 km east of Box Elder, Hill Co., Montana, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Frank Cathcart Calkins (1878-1974), geologist with the U.S. Geological Survey.

Calkinsite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.7565:1:0.7067

Cell Dimensions:

a = 9.57, b = 12.65, c = 8.94, Z = 4; V = 1,082.28 Den(Calc)= 3.26

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁221

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

By Intensity(I/I_o): 6.54(1), 3.27(0.5), 4.78(0.4),

Physical Properties of Calkinsite-(Ce)

Cleavage:

{010} Perfect, {101} Distinct

Color:

Light yellow.

Density:

3.27 - 3.29, Average = 3.28

Hardness:

2.5 - Finger Nail

Optical Properties of Calkinsite-(Ce)

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1955,KPDmeas= 0.1943,KC= 0.1878
Ncalc = 1.61 - 1.62

Optical Data:

Biaxial (-), a=1.569, b=1.657, g=1.686, bire=0.1170, 2V(Calc)=56, 2V(Meas)=54.

Calculated Properties of Calkinsite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Calkinsite-(Ce) =3.28 gm/cc.

Fermion Index:

Fermion Index = 0.0010530403
Boson Index = 0.9989469597

Photoelectric:

PE_{Calkinsite-(Ce)}= 258.58 barns/electron
U=PE_{Calkinsite-(Ce)} x r_electron= 783.20 barns/cc.

Radioactivity:

GRapi = 51,800.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Calkinsite-(Ce) per GRapi unit = 19.30 (PPM)

Calkinsite-(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) 587.19 ±146.80 grams of pure Calkinsite-(Ce) .

**Estimated Radioactivity from Calkinsite-(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 / 8.35 cm	1,178,003	3.18E-05	51,800.09	17.03
100 gm / 3.88 cm	117,800	3.18E-06	5,180.01	1.70
10 gm / 1.80 cm	11,780	3.18E-07	518.00	0.17
1 gm / 8.35 mm	1,178	3.18E-08	51.80	0.02
0.1 gm / 3.88 mm	118	3.18E-09	5.18	0.00
0.01 gm / 1.80 mm	12	3.18E-10	0.52	0.00
0.001 gm / 0.84 mm	1	3.18E-11	0.05	0.00

Weight of pure Calkinsite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.28 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 ( 2.63 % Th) From Sum REE Elements (52.59 % REE)

Calkinsite-(Ce) Classification

Dana Class:

15.04.01.01 (15)Hydrated Carbonates

(15.04)Dana Type

(15.04.01)Dana Group

15.04.01.01 Calkinsite-(Ce) (Ce,La)2(CO3)3•4(H2O) P 2₁221 2 2 2

Strunz Class:

05.CC.25 05 - CARBONATES (NITRATES)

05.C - Carbonates without Additional Anions, with H2O

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

05.CC.25 Calkinsite-(Ce) (Ce,La)2(CO3)3•4(H2O) P 2₁221 2 2 2

05.CC.25 Lanthanite-(Ce) (Ce,La)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

05.CC.25 Lanthanite-(La) (La,Ce)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

05.CC.25 Lanthanite-(Nd) (Nd,La)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

Other Calkinsite-(Ce) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Calkinsite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
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

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

Calkinsite-(Ce)

(Ce,La)2(CO3)3•4(H2O)
Dana No: 15.04.01.01 Strunz No: 05.CC.25
Locality:

Notes:

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