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Genthelvite

Year of discovery: 1944 (West Cheyenne Canon, USA), 2005 (Japan)

Locality list: A locality of genthelvite

• Zn₄Be₃(SiO₄)₃S
• [Zn²⁺₄][S|(Be²⁺SiO₄)₃]^8-

• Class: Helvine group
• Class: Tecto-Beryllium Silicate - Sulfide
• Soluble in: HCl (Gel residue)
• Fluorescence: UV excitation (Green), Phosphorescence

• Zn => Mn: Helvine (Series)
• Zn => Fe: Danalite (Series)

• Color: Colorless, Brown, Green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 6-6.5
• Density: 3.6

• System: Cubic
• Group: (-4)3m, P(-4)3n
• Lattice: a=8.1