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Monazite-(Ce) (Photo)

Year of discovery: 1829 (Ilmen Natural Reserve, Russia), 1899 (Japan)

Locality list: 251 localities of monazite-(Ce)

CePO₄

(Ce,La,Nd,Th)PO₄

[Ce³⁺][PO₄]^3-

• Class: Monazite group
• Class: Phosphate
• Soluble in: HCl (Decompose), HNO₃ (Decompose), H₂SO₄ (Decompose)
• Magnetism: Paramagnetic
• Fluorescence: Cathodo luminescence (Dark brown)
• Radioactive: Weak
• Ce => Fe: Rodolicoite
• Ce => Al: Berlinite
• Ce => Y: Xenotime-(Y)
• Ce => Sc: Pretulite
• Ce => Yb: Xenotime-(Yb)
• Ce => Nd: Monazite-(Nd)
• Ce => La: Monazite-(La)
• Ce => Sm: Monazite-(Sm)
• PO₄ => VO₄: Wakefieldite-(Ce)
• PO₄ => AsO₄: Gasparite-(Ce)
• Color: Yellowish brown
• Streak: White
• Luster: Adamantine
• Diaphaneity: Translucent
• Habit: Thick tabular
• Cleavage: Distinct on {100} (1 plane), Indistinct on {010}, {110}, {101}, and {011} (5 planes), Parting on {001} and {111} (3 planes)
• 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