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Matsubaraite

Year of discovery: 2001 (Japan as the first occurence in the World)

Locality list: 2 localities of matsubaraite

• Sr₄Ti₅Si₄O₂₂
• [Sr²⁺₄][Ti⁴⁺][Ti⁴⁺₄][O₈|(Si₂O₇)₂]^28-

• Class: Chevkinite group
• Class: Sorosilicate - Oxide

• Ti => Zr: Rengeite
• Ti => Fe: Strontiochevkinite

• Color: Pale bluish gray
• Streak: White
• Luster: Adamantine
• Diaphaneity: Transparent

• Habit: Long prismatic

• Cleavage: No
• Hardness: 5-6

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=13.8, b=5.6, c=11.9, β=114.2

Etymology: Satoshi Matsubara (1946-), Japanese mineralogist of the National Science Museum, Japan.