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Liandratite

Year of discovery: 1975 (Antsakoa I pegmatite, Madagascar), 1996 (Japan)

Locality list: 2 localities of liandratite

• UNb₂O₈
• U(Nb,Ta)₂O₈
• [U⁶⁺][(NbO₄)₂]^6-

• Class: Niobate
• Radioactive: Very strong

• U => Ce₂: β-Fergusonite-(Ce)
• U => Nd₂: β-Fergusonite-(Nd)
• U => Ca₂: Calciosamarskite
• U => Y₂: Samarskite-(Y), Fergusonite-(Y), β-Fergusonite-(Y)
• U => Yb₂: Samarskite-(Yb)

• U⁶⁺ => U⁴⁺Fe: Ishikawaite, Petscheckite
• U⁶⁺ => (U⁴⁺,Fe)Y: Yttrocolumbite-(Y)

• Color: Yellow, Brownish yellowk
• Streak: Yellow
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 3.5
• Density: 6.8

• System: Trigonal
• Group: (-3)m, P(-3)1m
• Lattice: a=6.4, c=4.0