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Rengeite

Year of discovery: 1999 (Japan as the first occurence in the World)

Locality list: 3 localities of rengeite

• Sr₄ZrTi₄Si₄O₂₂
• [Sr²⁺₄][Zr⁴⁺][Ti⁴⁺₄][O₈|(Si₂O₇)₂]^28-

• Class: Chevkinite group
• Class: Sorosilicate - Oxide
• Radioactive: Moderate

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

• Color: Dark greenish brown
• Streak: Pale greenish brown
• Luster: Adamantine
• Diaphaneity: Transparent

• Hardness: 5-5.5

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=14.0, b=5.7, c=12.0, β=114.2