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Euclase

Year of discovery: 1792 (Ouro Preto, Brazil), 2011 (Japan)

Locality list: A locality of euclase

• BeAlSiO₄(OH)
• [Be²⁺][Al³⁺][OH|SiO₄]^5-

• Class: Nesosilicate - Hydroxide

• Be => Ca: Vuagnatite

• Color: Colorless, White, Pale blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {010} (1 plane), Imperfect on {110} and {001} (1 plane)
• Hardness: 7.5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=4.8, b=14.3, c=4.6, β=100.3