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Willemite [abbr. Wlm ]

Year of discovery: 1830 (Vieille Montagne (Altenberg, Kelmisberg), Belgium), 1992 (Japan)

Locality list: 4 localities of willemite

• Zn₂SiO₄
• [Zn²⁺₂][SiO₄]^4-

• Class: Phenakite group
• Class: Nesosilicate
• Soluble in: HCl (Gel residue)
• Fluorescence: UV excitation (Yellow-Green), Phosphorescence (Green)

• Zn => Be: Phenakite
• Zn => Mg: Forsterite, Ringwoodite, Wadsleyite
• Zn => Fe: Fayalite
• Zn => Ca: Calcio-olivine
• Zn => Ni: Liebenbergite
• Zn => Mn: Tephroite

• Zn₂ => CaMg: Monticellite
• Zn₂ => CaMn: Glaucochroite
• Zn₂ => CaFe: Kirschsteinite
• Zn₂ => LiAl: Eucryptite

• Color: Colorless, Green, Blue, Yellowish brown, Pink, Black
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Massive

• Cleavage: Good on {1120} (3 planes), Poor on {0001} (1 plane)
• Hardness: 5.5
• Density: 4.1

• System: Trigonal
• Group: (-3), R(-3)
• Lattice: a=13.9, c=9.3