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Whewellite

Year of discovery: 1840 (Cavnic, Romania), 2022 (Japan)

Locality list:

Locality list: A locality of whewellite

• CaC₂O₄,H₂O
• [Ca²⁺][(COO)₂]^2-,H₂O

• Class: Oxalate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Insoluble in: Water
• Formed on dehydration of Weddellite in the air.

• Ca => (NH₄)₂: Oxammite

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

• Color: Colorless, White, Yellow
• Streak: White
• Luster: Vitreous, Pearly
• Diaphaneity: Trasnparent, Translucent

• Cleavage: Good on {-101} (1 plane), Imperfect on {010} (1 plane), Indistinct on {001}{110} (2 planes)
• Hardness: 2.5 - 3
• Density: 2.2

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=6.3, b=14.6, c=10.1, β=109.5