Weddellite Mineral Data

General Weddellite Information

Chemical Formula:

Ca(C2O4)•2(H2O)

Composition:

Molecular Weight = 164.13 gm

Calcium 24.42 % Ca 34.17 % CaO

Hydrogen 2.46 % H 21.95 % H₂O

Carbon 14.64 % C 43.88 % C₂O₃

Oxygen 58.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca(C₂O₄)•2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1942

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for the Weddel sea, Antactica.

Name Pronunciation:

Weddellite + Pronunciation

Synonym:

Calcium Oxalate

ICSD 30783

PDF 17-541

Weddellite Image

Images:

Weddellite

Comments: Tan prismatic weddellite crystal sprays in vug.
Location: Near Biggs, Wasco County, Oregon, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Weddellite Crystallography

Axial Ratios:

a:c = 1:0.59635

Cell Dimensions:

a = 12.33, c = 7.353, Z = 8; V = 1,117.87 Den(Calc)= 1.95

Crystal System:

Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4/m

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

By Intensity(I/I_o): 6.18(1), 2.775(0.65), 4.42(0.3),

Physical Properties of Weddellite

Cleavage:

{010} Good

Color:

Colorless, Tan, White, Yellowish brown, Brown.

Density:

2.02

Diaphaneity:

Transparent

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Weddellite

Gladstone-Dale:

CI meas= -0.804 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.869 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2736,KPDmeas= 0.2641,KC= 0.1464
Ncalc = 1.29 - 1.3

Optical Data:

Uniaxial (+), w=1.523, e=1.544, bire=0.0210.

Calculated Properties of Weddellite

Electron Density:

Bulk Density (Electron Density)=2.07 gm/cc
note: Specific Gravity of Weddellite =2.02 gm/cc.

Fermion Index:

Fermion Index = 0.0022240567
Boson Index = 0.9977759433

Photoelectric:

PE_Weddellite= 3.15 barns/electron
U=PE_Weddellite x rElectron Density= 6.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weddellite is Not Radioactive

Weddellite Classification

Dana Class:

50.01.02.01 (50)Salts of Organic Acids

(50.01)(Oxalates)

(50.01.02)Weddellite Group

50.01.02.01 Weddellite Ca(C2O4)•2(H2O) I 4/m 4/m

50.01.02.02 Caoxite! Ca(C2O4)•3(H2O) P1 1

Strunz Class:

10.AB.40 10 - ORGANIC COMPOUNDS

10.A - Salts of Organic Acids

10.AB -Oxalates

10.AB.40 Weddellite Ca(C2O4)•2(H2O) I 4/m 4/m

Other Weddellite Information

References:

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

See Also:

Links to other databases for Weddellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Weddellite Specimen Label here :

Weddellite

Ca(C2O4)•2(H2O)
Dana No: 50.01.02.01 Strunz No: 10.AB.40
Locality:

Notes:

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