Mineral Factbook

Weddellite

Ca(C2O4)·2H2OIMA symbol: Wedgrandfathered

Weddellite is an organic mineral with the formula Ca(C2O4)·2H2O, crystallizing in the tetragonal system. It has a calculated density of 1.976 g/cm3. Its streak is white.

Photos

Weddellite specimen photo
Kempf EK · CC BY-SA 3.0 · Commons
Weddellite specimen photo
Kempf EK · CC BY-SA 3.0 · Commons
Weddellite specimen photo
Kempf EK · CC BY 3.0 · Commons
Weddellite specimen photo
Kempf EK · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemtetragonal crystal systemWikidata (CC0)
Space groupI 4/m
Cell (Å, °)a = 12.3363, b = 12.3363, c = 7.3448; α = 90, β = 90, γ = 90
Cell volume1117.76 ų, Z = 8
Axial ratios1.0000:1:0.5954calculated from COD 9016974
Source structureCOD 9016974 (American Mineralogist, 2014) — 1 of 18 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)6.1682.7714.4112.2381.8951.833
I/I₀10087.630.728.92119.6

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9016974; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)1.976 g/cm³calculated from COD 9016974
Streak
whitesingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight164.13 g/molcalculated from the IMA formula
Composition (wt%)Ca 24.42%, C 14.64%, O 58.49%, H 2.46%

Classification

Nickel-Strunz (10th)10.AB.40Wikidata (CC0)
Nickel-Strunz (9th)10.AB.40Wikidata (CC0)
Dana (8th)50.1.2.1Wikidata (CC0)