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Petscheckite

Year of discovery: 1975 (Antsakoa I pegmatite, Madagascar), 1999 (Japan)

Locality list: 3 localities of petscheckite

• UFeNb₂O₈
• (U,Fe)NbO₄
• [U⁴⁺][Fe²⁺][(NbO₄)₂]^6-

• Class: Niobate
• Radioactive: Very strong

• Polymorph: Ishikawaite (Orthorhombic)

• Fe => Y: Yttrocolumbite-(Y)

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

• U⁴⁺Fe => U⁶⁺: Liandratite

• Color: Black
• Streak: Dark brown
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 5
• Density: 5.5

• System: Hexagonal
• Lattice: a=6.4, c=4.0