[ Top ] [ Japanese ]

Ningyoite

Year of discovery: 1957 (Japan as the first occurence in the World)

Locality list: 8 localities of ningyoite

• CaU(PO₄)₂,1-2H₂O
• (U,Ca,Ce)₂(PO₄)₂,1-2H₂O
• [(Ca²⁺,U⁵⁺)₂][(PO₄)₂]^6-,1-2H₂O

• Class: Ningyoite group
• Class: Phosphate - Hydrate
• Soluble in: HCl
• Radioactive: Very strong

• Color: Greenish brown, Dark brown
• Luster: Greasy
• Diaphaneity: Translucent

• Habit: Acicualr, Elongated rhombohedral

• Cleavage: No
• Hardness: 3-4
• Density: 4.8

• System: Orthorhombic
• Group: 222, P222
• Lattice: a=6.8, b=12.1, c=6.4

Etymology: Ningyo moutain pass in Okayama prefecture, Japan, where this mineral was discovered for the first time.