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Buddingtonite

Year of discovery: 1964 (Sulphur Bank mine, USA), 1979 (Japan)

Locality list: 2 localities of buddingtonite

• (NH₄)AlSi₃O₈
• [NH₄]⁺[AlSi₃O₈]^-

• Class: Ammonium - Tecto-Aluminosilicate

• Color: Colorless
• Streak: White
• Luster: Earthy
• Diaphaneity: Transparent

• Cleavage: Perfect on {001} and {010} (2 planes)
• Hardness: 5.5
• Density: 2.3

• System: Monoclinic
• Group: 2, P2₁
• Lattice: a=8.6, b=13.0, c=7.2, β=112.7