Coskrenite-(Ce) Mineral Data

Coskrenite-(Ce) Mineral Data
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General Coskrenite-(Ce) Information

Help on Chemical Formula: Chemical Formula: (Ce,Nd,La)2(SO4)2(C2O4)•8(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ce1.1Nd0.6La0.3(SO4)2(C2O4)•8(H2O)
Help on Environment: 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.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Alum Cave Bluff, Tennessee, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for T. Dennis Coskren (1942-), geologist from Columbia, Maryland, whose work was instrumental in the discovery to the mineral.
Help on Synonym: Synonym: IMA1996-056
 

Coskrenite-(Ce) Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.476:1:0.7168
Help on Cell Dimensions: Cell Dimensions: a = 8.718, b = 18.313, c = 13.128, Z = 6; beta = 94° V = 2,090.82 Den(Calc)= 3.37
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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
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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)

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Pink, Very pale blue, Cream.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Habit: Habit: Water Soluble - Water soluble mineral.
Help on Habit: Habit: Wedge shaped - Crystals shaped like a wedge.
Help on Luminescence: Luminescence: Non-fluorescent, Short UV=very pale blue, Long UV=very pale blue.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Coskrenite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1705,KC= 0.1761
Ncalc = 1.59
Help on Optical Data: 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)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Coskrenite-(Ce) =3.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECoskrenite-(Ce) = 200.21 barns/electron
U=PECoskrenite-(Ce) x relectron= 643.37 barns/cc.
Help on Radioactivity: 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
Bequerols
(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
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( AmMin, vol 85, p1561) PHYS. PROP.(AmMin, vol 85, p1561) OPTIC PROP.(AmMin, vol 85, p1561)
Help on See Also: 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: