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Bastnäsite-(Ce), Bastnasite-(Ce)

Year of discovery: 1841 (Bastnäs mine, Sweden), 1963 (Japan)

Locality list: 15 localities of bastnäsite-(Ce)

• CeCO₃F
• (Ce,La)CO₃(F,OH)
• [Ce³⁺][F|CO₃]^3-

• Class: Bastnäsite (Bastnasite) group
• Class: Carbonate - Fluoride
• Soluble in: concentrated hot HCl, concentrated hot HNO₃, concentrated hot H₂SO₄
• Insoluble in: dilute HCl
• Radioactive: Weak
• Substitution pseudomorph: Replace Fluocerite-(Ce) or Chevkinite-(Ce).

• Ce => La: Bastnäsite-(La), Bastnasite-(La)
• Ce => Y: Bastnäsite-(Y), Bastnasite-(Y)

• F => OH: Hydroxylbastnäsite-(Ce) (Hydroxylbastnasite-(Ce)) (Series)

• Color: Yellow-Reddish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Indistinct {1010} (3 planes), Parting on {0001} (1 plane)
• Hardness: 4-4.5
• Density: 5.0

• System: Hexagonal
• Group: (-6)m2, P(-6)2c
• Lattice: a=7.2, c=9.8