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Vesuvianite (Photo) [abbr. Ves ]

Year of discovery: 1795 (Monte Somma, Italy), 1892 (Japan)

Locality list: 196 localities of vesuvianite

• Ca₁₉Al₁₁Mg₂Si₁₈O₆₉(OH)₉
• (Ca,Na)₁₉(Al,Mg,Fe)₁₃([],B,Al,Fe)₅Si₁₈O₆₈(OH,F,O)₁₀
• [Ca²⁺₁₉][Al³⁺₁₁][Mg²⁺₂][][(OH)₉|O|(SiO₄)₁₀|(Si₂O₇)₄]^75-

• Class: Vesuvianite group
• Class: Sorosilicate - Nesosilicate - Hydroxide
• Soluble in: HCl (Decompose)

• Mg => Mn: Manganovesuvianite

• [Al][O] => [Cu][OH]: Cyprine

• [] => B: Wiluite

• OH => F: Fluorvesuvianite

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

• Habit: Tetra prismatic, Acicular, Pyramidal
• Aggregate: Columnar, Radial

• Cleavage: Poor on {100} (2 planes), Imperfect on {100} and {001} (2 planes)
• Hardness: 6.5
• Density: 3.4

• System: Tetragonal
• Group: 4/m, P4/n
• Lattice: a=15.5, c=11.8

Etymology: Vesuvios volcano in Italy