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 Boy’s 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.

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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 - DisphenoidalH-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 Becquerels (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: