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Kaersutite (Photo) [abbr. Krs ]

Year of discovery: 1884 (Qaarsut (Kaersut), Greenland), 1928 (Japan)

Locality list: 64 localities of kaersutite

• NaCa₂Mg₃TiAl₃Si₆O₂₄
• [Na⁺][Ca²⁺₂][Mg²⁺₃][Ti⁴⁺][Al³⁺][O₂|(AlSi₃O₁₁)₂]^18-

• Class: w(O)-dominant amphibole group < Amphibole supergroup
• Class: Ino-Aluminosilicate (Double chain) - Oxide

• Mg => Fe: Ferro-kaersutite (Series)

• Al => Fe³⁺: Ferri-kaersutite

• TiO => Al: Pargasite
• TiO => Fe: Magnesio-hastingsite
• TiO => Cr: Chromio-pargasite

• Color: Dark brown, Black
• Streak: Pale brown
• Luster: Vitreous
• Diaphaneity: Tranlucent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree)
• Hardness: 5-6
• Density: 3.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.9, b=18.1, c=5.3, β=105.4

Etymology: Kaersuti district, Greenland