Coskrenite-(Ce)
A valid IMA mineral species
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About Coskrenite-(Ce)
T.D. Coskren
Formula:
(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2O
Colour:
Usually pale pink under incandescent light, to cream-colored
Lustre:
Vitreous
Specific Gravity:
2.881 (Calculated)
Crystal System:
Triclinic
Name:
Named in honor of T. Dennis Coskren (b. 1942), American geochemist and mineralogist who undertook a study of the minerals at Alum Cave (the type locality).
Type Locality:
This page provides mineralogical data about Coskrenite-(Ce).
Unique Identifiers
Mindat ID:
6890
Long-form identifier:
mindat:1:1:6890:7
GUID
(UUID V4):
(UUID V4):
683993b4-c670-4851-a52e-36f169ed591a
Classification of Coskrenite-(Ce)
Approved
Approval year:
1996
First published:
1999
Type description reference:
10.AB.65
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ckr-Ce | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Coskrenite-(Ce)
Vitreous
Transparency:
Transparent
Colour:
Usually pale pink under incandescent light, to cream-colored
Comment:
The pale pink material becomes pale blue under fluorescent lighting.
Streak:
White
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Density:
2.881 g/cm3 (Calculated)
Optical Data of Coskrenite-(Ce)
Type:
Biaxial (-)
RI values:
nα = 1.544(4) nβ = 1.578(4) nγ = 1.602(4)
2V:
Measured: 65° (10), Calculated: 69°
Birefringence:
(r > v), and Z' ^ c = 21 deg
Max Birefringence:
δ = 0.058
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
medium
Pleochroism:
Not Visible
Chemical Properties of Coskrenite-(Ce)
Formula:
(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2O
IMA Formula:
Ce2(SO4)2(C2O4) · 8H2O
Crystallography of Coskrenite-(Ce)
Crystal System:
Triclinic
Cell Parameters:
a = 6.007(1) Å, b = 8.368(2) Å, c = 9.189(2) Å
α = 99.90(2)°, β = 105.55(2)°, γ = 107.71(2)°
α = 99.90(2)°, β = 105.55(2)°, γ = 107.71(2)°
Ratio:
a:b:c = 0.718 : 1 : 1.098
Unit Cell V:
407.41 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Aggregates of tabular, wedge-shaped crystals. Individual crystals are up to ~0.7 mm in width and are flattened on {100}, with edges defined by {010} and {001}.
Comment:
Crystal class 1 1; Space group P1or P1.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005635 | Coskrenite-(Ce) | Peacor D R, Rouse R C, Essene E J, Lauf R J (1999) 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 The Canadian Mineralogist 37 1453-1462 |  | 1999 | Alum Cave Bluff, Tennessee, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.48 Å | (100) |
| 8.52 Å | (70) |
| 6.72 Å | (60) |
| 3.84 Å | (60) |
| 4.26 Å | (50) |
| 3.35 Å | (40) |
| 2.744 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Coskrenite-(Ce)
General Appearance of Type Material:
Aggregates of tabular, wedge-shaped, euhedral crystals.
Place of Conservation of Type Material:
U.S. National Museum of Natural History and the Department of Geological Sciences of the University of Michigan
Geological Setting of Type Material:
Cave
Associated Minerals at Type Locality:
Reference:
Peacor, D.R., Rouse, R.C., Essene, E.J. (1999) 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. The Canadian Mineralogist: 37: 1453-1462.
Synonyms of Coskrenite-(Ce)
Other Language Names for Coskrenite-(Ce)
German:Coskrenit
Coskrenit-(Ce)
Coskrenit-(Ce)
Spanish:Coskrenita
Related Minerals - Strunz-mindat Grouping
| 10.AB. | Deveroite-(Ce) | Ce2(C2O4)3 · 10H2O | Mon. 2/m : P21/b |
| 10.AB.X | Falottaite | MnC2O4 · 3H2O | Orth. mmm (2/m 2/m 2/m) |
| 10.AB. | Uroxite | [(UO2)2(C2O4)(OH)2(H2O)2] · H2O | Mon. 2/m : P21/b |
| 10.AB.05 | Humboldtine | Fe2+(C2O4) · 2H2O | Mon. 2/m |
| 10.AB.05 | Lindbergite | Mn2+(C2O4) · 2H2O | Mon. 2/m |
| 10.AB.05 | Katsarosite | Zn(C2O4) · 2H2O | Mon. 2/m : B2/b |
| 10.AB.10 | Glushinskite | Mg(C2O4) · 2H2O | Mon. 2/m : B2/b |
| 10.AB.15 | Moolooite | Cu(C2O4) · nH2O | Orth. |
| 10.AB.20 | Stepanovite | NaMgFe3+(C2O4)3 · 8-9H2O | Trig. 3m : P3c1 |
| 10.AB.25 | Minguzzite | K3Fe3+(C2O4)3 · 3H2O | Mon. 2/m : P21/b |
| 10.AB.30 | Wheatleyite | Na2Cu(C2O4)2 · 2H2O | Tric. 1 : P1 |
| 10.AB.35 | Zhemchuzhnikovite | NaMgAl(C2O4)3 · 8H2O | Trig. 3m : P3c1 |
| 10.AB.40 | Weddellite | Ca(C2O4) · (2.5-x)H2O | Tet. 4/m : I4/m |
| 10.AB.45 | Whewellite | Ca(C2O4) · H2O | Mon. 2/m : P21/b |
| 10.AB.47 | Fiemmeite | Cu2(C2O4)(OH)2 · 2H2O | Mon. 2/m : P21/b |
| 10.AB.50 | Caoxite | Ca(C2O4) · 3H2O | Tric. 1 : P1 |
| 10.AB.50 | Middlebackite | Cu2C2O4(OH)2 | Mon. 2/m : P21/b |
| 10.AB.52 | Metauroxite | (UO2)2(C2O4)(OH)2(H2O)2 | Tric. 1 : P1 |
| 10.AB.55 | Oxammite | (NH4)2(C2O4) · H2O | Orth. 2 2 2 : P21 21 2 |
| 10.AB.60 | Natroxalate | Na2(C2O4) | Mon. 2/m : P21/b |
| 10.AB.60 | Phoxite | (NH4)2Mg2(C2O4)(PO3OH)2(H2O)4 | Mon. 2/m : P21/b |
| 10.AB.70 | Levinsonite-(Y) | (Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O | Mon. 2/m |
| 10.AB.75 | Zugshunstite-(Ce) | (Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O | Mon. 2/m : B2/b |
| 10.AB.80 | Novgorodovaite | Ca2(C2O4)Cl2 · 2H2O | Mon. 2/m |
Fluorescence of Coskrenite-(Ce)
None observed
Other Information
Notes:
Readily soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Coskrenite-(Ce)
mindat.org URL:
https://www.mindat.org/min-6890.html
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Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Coskrenite-(Ce)
Reference List:
Localities for Coskrenite-(Ce)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
|
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Alum Cave Bluff, Sevier County, Tennessee, USA