Coskrenite-(Ce) Mineral Data

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General Coskrenite-(Ce) Information

Chemical Formula:

(Ce,Nd,La)2(SO4)2(C2O4)•8(H2O)

Composition:

Molecular Weight = 706.61 gm

Lanthanum 5.90 % La 6.92 % La₂O₃

Cerium 21.81 % Ce 25.55 % Ce₂O₃

Hydrogen 2.28 % H 20.40 % H₂O

Carbon 3.40 % C 10.19 % C₂O₃

Sulfur 9.08 % S 22.66 % SO₃

Neodymium 12.25 % Nd 14.29 % Nd₂O₃

Oxygen 45.28 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_1.1Nd_0.6La_0.3(SO₄)₂(C₂O₄)•8(H₂O)

Environment:

Associated with epsomite and "hair salts" in soil sheltered by an overhanging bluff. The sulfate is from the oxidation of pyritiferous shales in the bedrock.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Alum Cave Bluff, Tennessee, USA. Link to MinDat.org Location Data.

Name Origin:

Named for T. Dennis Coskren (1942-), geologist from Columbia, Maryland, whose work was instrumental in the discovery to the mineral.

Synonym:

IMA1996-056

Coskrenite-(Ce) Image

Images:

Coskrenite-(Ce)

Comments: SEM image of coskrenite-(Ce) crystals in cavities in epsomite. (CanMin, v37:1453).
Location: AIum Cave Bluff, Great Smoky Mountains, Tennessee. Scale: See Image.
© Canadian Mineralogist

Coskrenite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.476:1:0.7168

Cell Dimensions:

a = 8.718, b = 18.313, c = 13.128, Z = 6; beta = 94° V = 2,090.82 Den(Calc)= 3.37

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 5.48(1)(110), 8.52(0.7)(001), 3.84(0.6)(020,110), 6.72(0.6)(011), 4.26(0.5)(002,012), 2.744(0.4)(122,212

Crystal Structure:

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Peacor D R , Rouse R C , Essene E J , Lauf R J , The Canadian Mineralogist , 37 (1999) p.1453-1462, Coskrenite-(Ce), (Ce,Nd,La)2(SO4)2(C2O4).8H2O, a new rare-earth oxalate mineral, from Alum Cave Bluff, Tennessee: Characterization and crystal structure, Locality: Alum Cave Bluff, Tennessee, USA

Physical Properties of Coskrenite-(Ce)

Cleavage:

{001} Perfect

Color:

Pink, Very pale blue, Cream.

Diaphaneity:

Transparent

Fracture:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Habit:

Water Soluble - Water soluble mineral.

Habit:

Wedge shaped - Crystals shaped like a wedge.

Luminescence:

Non-fluorescent, Short UV=very pale blue, Long UV=very pale blue.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Coskrenite-(Ce)

Gladstone-Dale:

CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1705,KC= 0.1761
Ncalc = 1.59

Optical Data:

Biaxial (-), a=1.544, b=1.578, g=1.602, bire=0.0580, 2V(Calc)=78, 2V(Meas)=65. Dispersion medium, r > v.

Calculated Properties of Coskrenite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Coskrenite-(Ce) =3.37 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Coskrenite-(Ce)}= 200.21 barns/electron
U=PE_{Coskrenite-(Ce)} x r_electron= 643.37 barns/cc.

Radioactivity:

GRapi = 40,641.96 (Gamma Ray American Petroleum Institute Units)
Concentration of Coskrenite-(Ce) per GRapi unit = 24.61 (PPM)

Coskrenite-(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) 748.41 ±187.10 grams of pure Coskrenite-(Ce) .

**Estimated Radioactivity from Coskrenite-(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 / 8.28 cm	895,042	2.42E-05	40,641.96	13.36
100 gm / 3.84 cm	89,504	2.42E-06	4,064.20	1.34
10 gm / 1.78 cm	8,950	2.42E-07	406.42	0.13
1 gm / 8.28 mm	895	2.42E-08	40.64	0.01
0.1 gm / 3.84 mm	90	2.42E-09	4.06	0.00
0.01 gm / 1.78 mm	9	2.42E-10	0.41	0.00
0.001 gm / 0.83 mm	1	2.42E-11	0.04	0.00

Weight of pure Coskrenite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.37 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 ( 2.00 % Th) From Sum REE Elements (39.96 % REE)

Coskrenite-(Ce) Classification

Dana Class:

50.01.09.02 (50)Salts of Organic Acids

(50.01)(Oxalates)

(50.01.09)Zugshunstite Group

50.01.09.01 Zugshunstite-(Ce)! (Ce,Nd,La)Al(SO4)2(C2O4)•8(H2O) C 2/c 2/m

50.01.09.02 Coskrenite-(Ce)! (Ce,Nd,La)2(SO4)2(C2O4)•8(H2O) C 2/c 2/m

50.01.09.03 Levinsonite-(Y)! (Y,Nd,La)Al(SO4)2(C2O4)•12(H2O) P 2/n 2/m

Strunz Class:

10.AB.65 10 - ORGANIC COMPOUNDS

10.A - Salts of Organic Acids

10.AB -Oxalates

10.AB.65 Coskrenite-(Ce)! (Ce,Nd,La)2(SO4)2(C2O4)•8(H2O) C 2/c 2/m

Other Coskrenite-(Ce) Information

References:

NAME( AmMin, vol 85, p1561) PHYS. PROP.(AmMin, vol 85, p1561) OPTIC PROP.(AmMin, vol 85, p1561)

See Also:

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

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

Coskrenite-(Ce)

(Ce,Nd,La)2(SO4)2(C2O4)•8(H2O)
Dana No: 50.01.09.02 Strunz No: 10.AB.65
Locality:

Notes: