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Diaoyudaoite

Type Locality
Okinawa Trough, Senkaku Islands (Diaoyudao Islands; Diaoyutai Islands), Okinawa Prefecture, Nansei Archipelago, Kyushu Region, Japan
Mineral Data
NaAl11O17
Strunz: 
4.CC.45
Physical Properties
Crystal System: 
Hexagonal
Hardness: 
7.5 - 8.0