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Haapalaite

Year of discovery: 1973 (Kokka deposit, Finland), 1991 (Japan)

Locality list: A locality of haapalaite

• (Fe,Ni)₂Mg_1.61S₂(OH)_3.22
• (Fe,Ni)₂(Mg,Fe)_1.61S₂(OH)_3.22
• 2[(Fe²⁺,Ni²⁺)][S]^2-,1.61[Mg²⁺][(OH)₂]^2-

• Class: Sulfide - Hydroxide
• Magnetism: Paramagnetic

• (Fe,Ni) => (Fe,Cu): Valleriite
• (Fe,Ni) => Fe: Tochilinite
• (Fe,Ni) => V_0.5: Yushkinite

• Color: Reddish brown, Pale brown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Thin scale

• Cleavage: Perfect (1 plane)
• Hardness: 1
• Density: 3.6

• System: Hexagonal
• Lattice: a=3.6, c=34.0

Etymology: Paavo Haapala, Finnish geologist