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Hydrowoodwardite

Year of discovery: 1996 (St Briccius mine, Germany), 2008 (Japan)

Locality list: 2 localities of hydrowoodwardite

• Cu₅Al₄(SO₄)₂(OH)₁₈,nH₂O
• (Cu,Al)₉(SO₄)₂(OH)₁₈,nH₂O
• [Cu²⁺₅][Al³⁺₄][(OH)₁₈|(SO₄)₂]^22-,nH₂O

• Class: Glaucocerinite group < Hydrotalcite supergroup
• Class: Sulfate - Hydroxide - Hydrate
• Dehydrate to Woodwardite slowly under dry condition.
• Formed by hydration of Woodwardite under humid condition.

• Color: Blue, Greenish blue
• Streak: Pale blue
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: No
• Density: 2.3

• System: Trigonal
• Group: (-3)m, R(-3)m
• Lattice: a=3.1, c=31.9