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Monazite-(La)

Year of discovery: 1966 (Kounrad Massif, Kazakhstan), 1999 (Japan)

Locality list: 2 localities of monazite-(La)

• LaPO₄
• (La,Ce,Nd)PO₄
• [La³⁺][PO₄]^3-

• Class: Monazite group
• Class: Phosphate

• La => Fe: Rodolicoite
• La => Al: Berlinite
• La => Y: Xenotime-(Y)
• La => Sc: Pretulite
• La => Yb: Xenotime-(Yb)
• La => Nd: Monazite-(Nd)
• La => Ce: Monazite-(Ce)
• La => Sm: Monazite-(Sm)

• PO₄ => VO₄: Wakefieldite-(La)

• Color: Brown, Yellow
• Streak: Pale gray
• Luster: Adamantine
• Diaphaneity: Transparent-Translucent

• Cleavage: Distinct on {001} (1 plane), Indistinct on {100} (1 plane)
• Hardness: 5-5.5
• Density: 5.2

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=6.8, b=7.0, c=6.5, β=103.6

Etymology: Monazein (Lonliness) in Greek