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Rosasite (Photo)

Year of discovery: 1908 (Rosas mine, Italy), 1971 (Japan)

Locality list: 5 localities of rosasite

• (Cu,Zn)₂(CO₃)(OH)₂
• [(Cu²⁺,Zn²⁺)₂][(OH)₂|CO₃]^4-
• Cu/Zn=1.5

• Class: Rosasite group
• Class: Carbonate - Hydroxide
• Soluble in: HCl, HNO₃, H₂SO₄

• (Cu,Zn) => (Cu,Ni): Glaukosphaerite
• (Cu,Zn) => (Cu,Co): Kolwezite
• (Cu,Zn) => (Mg,Cu): Mcguinnessite
• (Cu,Zn) => Mg: Pokrovskite
• (Cu,Zn) => Cu: Malachite
• (Cu,Zn) => Ni: Nullaginite
• (Cu,Zn) => Fe: Chukanovite

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

• Habit: Acicular
• Aggregate: Radial

• Cleavage: Distinct (2 planes)
• Hardness: 4.5
• Density: 4.1

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=12.9, b=9.4, c=3.2, β=110.4

Etymology: Rosa district in Sardinia Island, Italy