Mineralogy Database

Weddellite Mineral Data

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General Weddellite Information

Help on Chemical  Formula: Chemical Formula: Ca(C2O4)•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca(C2O4)•2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1942
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Weddel sea, Antactica.
Help on Name Pronunciation: Name Pronunciation: Weddellite + Pronunciation Say WEDDELLITE
Help on Synonym: Synonym: Calcium Oxalate
  ICSD 30783
  PDF 17-541

Weddellite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.59635
Help on Cell Dimensions: Cell Dimensions: a = 12.33, c = 7.353, Z = 8; V = 1,117.87 Den(Calc)= 1.95
Help on Crystal System: 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/Io): 6.18(1), 2.775(0.65), 4.42(0.3),

Physical Properties of Weddellite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Colorless, Tan, White, Yellowish brown, Brown.
Help on Density: Density: 2.02
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Weddellite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.523, e=1.544, bire=0.0210.

Calculated Properties of Weddellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.07 gm/cc
note: Specific Gravity of Weddellite =2.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0022240567
Boson Index = 0.9977759433
Help on Photoelectric: Photoelectric: PEWeddellite = 3.15 barns/electron
U=PEWeddellite x rElectron Density= 6.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weddellite is Not Radioactive

Weddellite Classification

Help on  Dana Class: Dana Class: (50)Salts of Organic Acids
  (50.01.02)Weddellite Group Weddellite Ca(C2O4)•2(H2O) I 4/m 4/m Caoxite! Ca(C2O4)•3(H2O) P1 1
Help on  Strunz Class: 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

Help on References: References: NAME( Athena) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 10.AB.40





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