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Willemseite

Year of discovery: 1968 (Bon Accord Ni deposit, South Africa)

Locality list:

• Ni₃Si₄O₁₀(OH)₂
• (Ni,Mg)₃Si₄O₁₀(OH)₂
• [Ni²⁺₃][(OH)₂|(Si₂O₅)₂]^6-

• Class: Talc-Pyrophyllite group
• Class: Phyllosilicate - Hydroxide

• Ni => Fe: Minnesotaite
• Ni => Mg: Talc

• Ni₃ => Fe₂: Ferripyrophyllite
• Ni₃ => Al₂: Pyrophyllite

• Color: Pale green
• Streak: Greenish white
• Luster: Resinous
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2
• Density: 3.3

• System: Monoclinic
• Group: m or 2/m, Cc or C2/c
• Lattice: a=5.3, b=9.2, b=9.1, c=19.0, β=100.0

Synonym: A part of Garnierite