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Edenite [abbr. Ed ]

Year of discovery: 1831 (Edenville, USA), 1975 (Japan)

Locality list: 28 localities of edenite

• NaCa₂Mg₅AlSi₇O₂₂(OH)₂
• [Na⁺][Ca²⁺₂][Mg²⁺₅][(OH)₂|AlSi₇O₂₂]^15-

• Class: Ca amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Ino-Aluminosilicate (Double chain) - Hydroxide
• Fluorescence: Short UV excitation (Blue green)

• Mg => Fe: Ferro-edenite (Series)

• OH => F: Fluoro-edenite

• NaMg => []Al: => Mangesio-hornblende
• NaMg => []Fe: Magnesio-ferri-hornblende

• NaAl => []Si: Tremolite

• CaMg => NaFe: Ferri-katophorite

• CaAl => NaSi: Richterite

• MgSi => Al₂: Pargasite (Series)
• MgSi => CrAl: Chromio-pargasite
• MgSi => FeAl: Magnesio-hastingsite

• Mg₂Si₂ => Al₄: Sadanagaite

• Color: White, Grey, Dark green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.0

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=18.0, c=5.3, β=105.2