[ Top ] [ Japanese ]

Norbergite [abbr. Nrb ]

Year of discovery: 1926 (Ostanmossa mine, Sweden), 1979 (Japan)

Locality list: 2 localities of norbergite

• Mg₃SiO₄F₂
• Mg₃SiO₄(F,OH)₂
• [Mg²⁺₃][F₂|SiO₄]^6-

• Class: Humite group
• Class: Nesosilicate - Fluoride
• Fluorescence: UV excitation (Yellow)

• Color: Yellowish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Distinct
• Hardness: 6-6.5
• Density: 3.2

• System: Orthorhombic
• Group: mmm, Pnma
• Lattice: a=8.7, b=4.7, c=10.3