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Tschermakite [abbr. Ts ]

Year of discovery: 1945 (World), 1971 (Japan)

Locality list: 11 localities of tschermakite

• Ca₂Mg₃Al₄Si₆O₂₂(OH)₂
• [][Ca²⁺₂][Mg²⁺₃][Al³⁺₂][(OH)₂|(AlSi₃O₁₁)₂]^16-

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

• Ca => Na₂: Taramite

• Mg => Fe: Ferro-tschermakite (Series)

• Al => Fe: Ferri-tschermakite

• []Al => NaMg: Pargasite
• []Al => KMg: Potassic-pargasite

• CaAl => NaSi: Barroisite

• []Si => NaAl: Sadanagaite

• Al₂ => MgSi: Magnesio-hornblende

• Al₄ => Mg₂Si₂: Tremolite

• Color: Green, Dark green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {110} (2 planes), Partings on {100} and {001} (2 planes)
• Hardness: 5-6
• Density: 3.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.8, b=18.0, c=5.3, β=105.1