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Osakaite

Year of discovery: 2007 (Japan as the first occurence in the World)

Locality list: A locality of osakaite

• Zn₄SO₄(OH)₆,5H₂O
• [Zn²⁺₄][(OH)₆|SO₄]^8-,5H₂O

• Class: Sulfate - Hydroxide - Hydrate
• Soluble in: HCl, HNO₃
• Dehydrate to Namuwite under dry condition.
• Formed by hydration of Namuwite under humid condition.

• 5H₂O => 4H₂O: Namuwite

• Color: White, Pale blue
• Streak: White, Pale blue
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 1
• Density: 2.7

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=8.4, b=8.3, c=11.0, α=95.0, β=83.2, γ=119.6

Etymology: Osaka prefecture, Japan, address of Hirao old mine shaft where this mineral was discovered for the first time.