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Kosmochlor [abbr. Kos ]

Year of discovery: 1894 (Toluca meteorite, Mexico), 1996 (Japan)

Locality list: 7 localities of kosmochlor

• NaCrSi₂O₆
• [Na⁺][Cr³⁺][(SiO₃)₂]^4-

• Class: Na pyroxene group < Pyroxene supergroup
• Class: Inosilicate (Single chain)

• Cr => Al: Jadeite
• Cr => Fe: Aegirine
• Cr => Mn: Namansilite
• Cr => V: Natalyite
• Cr => Sc: Jervisite

• Color: Green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Good on {110} (2 planes)
• Hardness: 6
• Density: 3.6

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=9.6, b=8.7, c=5.3, β=107.5