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Weddellite

Year of discovery: 1942 (Weddell Sea, Antarctica), 1975 (Japan)

Locality list: 2 localities of weddellite

• CaC₂O₄,2H₂O
• [Ca²⁺][(COO)₂]^2-,2H₂O

• Class: Weddellite group
• Class: Oxalate - Hydrate
• Insoluble in: Water
• Dehydrates to Whewellite in the air.

• Ca => Fe: Humboldtine
• Ca => Mn: Lindbergite
• Ca => Mg: Glushinskite

• 2H₂O => 3H₂O: Caoxite
• 2H₂O => H₂O: Whewellite

• Color: Colorless, Yellowish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Trasnparent

• Cleavage: No
• Hardness: 4
• Density: 1.9

• System: Tetragonal
• Group: 4/m, I4/m
• Lattice: a=12.4, c=7.4