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Zoisite [abbr. Zo ]

Year of discovery: 1805 (Prickler Halt, Austria, and Øvstebø, Norway), 1902 (Japan)

Locality list: 146 localities of zoisite

• Ca₂Al₃Si₃O₁₂(OH)
• [Ca²⁺₂][Al³⁺][Al³⁺₂][OH|O|SiO₄|Si₂O₇]^13-

• Class: Sorosilicate - Nesosilicate - Oxide - Hydroxide
• Variety: Thulite (+Mn³⁺, Pink)
• Insoluble in: HCl, HNO₃, H₂SO₄
• Fluorescence: UV excitation (Bluish white, Iwaki island)

• Polymorph: Clinozoisite (Monoclinic)

• Ca₂ => CaSr: Clinozoisite-(Sr)

• Al => Mn: Piemontite
• Al => Fe: Epidote
• Al => V: Mukhinite

• Color: Colorless, Gray, Yellow, Purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Prismatic

• Cleavage: Perfect on {010} (1 plane), Imperfect on {100} (1 plane)
• Hardness: 6-7
• Density: 3.3

• System: Orthorhombic
• Group: mmm, Pnma
• Lattice: a=16.2, b=5.5, c=10.0

Etymology: Sigmund Zois (1747-1819, noble of Slovenia