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Kobeite-(Y)

Year of discovery: 1950 (Japan as the first occurence in the World)

Locality list: 7 localities of kobeite-(Y)

• Y₂Ti₂O₇
• (Y,Zr,U)₂(Ti,Fe³⁺,Nb)₂(O,OH)₇
• [Y³⁺₂][Ti⁴⁺₂][O₇]^14-

• Class: Oxide
• Radioactive: Strong

• Color: Brown, Black
• Streak: Reddish brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Long prismatic
• Aggregate: fan-like

• Cleavage: No
• Hardness: 5.5
• Density: 4.6

• System: Cubic
• Lattice: a=5.0

Etymology: Kobe mine in Kyoto prefecture, Japan, where this mineral was discovered for the first time.