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Woodwardite

Year of discovery: 1866 (Cornwall, UK), 1981 (Japan)

Locality list: 3 localities of woodwardite

• Cu₄Al₂SO₄(OH)₁₂,2-4H₂O
• [Cu²⁺₄][Al³⁺₂][(OH)₁₂|SO₄]^14-,2-4H₂O

• Class: Woodwardite group < Hydrotalcite supergroup
• Class: Sulfate - Hydroxide - Hydrate
• Hydrat to Hydrowoodwardite under humid condition.
• Formed on dehydration of Hydrowoodwardite under dry condition.

• Color: Bluish green, Blue
• Streak: Pale blue
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Density: 2.4

• System: Trigonal
• Lattice: a=3.1, c=32.8