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Helvine (Photo)

It seems that approved name was changed from Helvite to Helvine.

Year of discovery: 1817 (Brüder Lorenz mine, German, and Friedefürst mine, Germany), 1959 (Japan)

Locality list: 26 localities of helvine

• Mn₄Be₃(SiO₄)₃S
• [Mn²⁺₄][S|(Be²⁺SiO₄)₃]^8-

• Class: Helvine group
• Class: Tecto-Beryllium Silicate - Sulfide
• Soluble in: HCl
• Fluorescence: UV excitation (Dark red)
• Odor: Rotten egg odor (by solving in HCl)

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

• Color: Yellow, Brown, Yellowish green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Tetragonal

• Cleavage: Distinct on {111} (4 planes)
• Hardness: 6-6.5
• Density: 3.3

• System: Cubic
• Group: (-4)3m, P(-4)3n
• Lattice: a=8.3

Synonym: Helvite