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Nybøite, Nyboite

Year of discovery: 1981 (Nybø Eclogite Pod, Norway), 1997 (Japan)

Locality list: A locality of nybøite

• Na₃Mg₃Al₂AlSi₇O₂₂(OH)₂
• [Na⁺][Na⁺₂][Mg²⁺₃][Al³⁺₂][(OH)₂|AlSi₇O₂₂]^15-

• Class: Na amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Ino-Aluminosilicate (Double chain) - Hydroxide
• Radioactive: Very weak

• Mg => Fe: Ferro-nybøite (Ferro-nyboite)

• Al => Fe: Ferri-nybøite (Ferri-nyboite)

• NaAl => []Si: Glaucophane

• Al₂ => MgSi: Eckermannite

• MgAl => LiSi: Leakeite

• Color: Blue, Grayish green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Good on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.1

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.7, b=17.8, c=5.3, β=104.1