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Category Oxide minerals
(repeating unit)
Strunz classification 4.DF.05
Dana classification
Crystal system Orthorhombic
Dipyramidal class
Space group Orthorhombic
H-M symbol: (2/m 2/m 2/m)
Space group: Pmnb
Unit cell a = 11.08, b = 7.56
c = 5.37 [Å]; Z = 4
Formula mass 305.70 g/mol
Color Brown, light brown, brownish black, yellow, black
Crystal habit Acicular, massive
Cleavage None
Fracture Brittle - conchoidal
Tenacity Brittle
Mohs scale hardness 5 - 6
Luster Adamantine, resinous to waxy, sub-metallic; dull when altered
Streak Nearly black to brown
Diaphaneity Transparent to translucent
Specific gravity 4.52
Density 5.19
Optical properties Isotropic when metamict
Refractive index 2.26
References [1][2][3][4][5]

Aeschynite-(Ce) (or Aschynite, Eschinite, Eschynite) is a rare earth mineral of cerium, calcium, iron, thorium, titanium, niobium, oxygen, and hydrogen with formula: (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6. Its name comes from the Greek word for "shame". The "-(Ce)" means it has more cerium than the yttrium variety aeschynite-(Y). Its Mohs scale rating is 5-6.


  1. ^ "Aeschynite-(Ce) Mineral Data". Retrieved 2011-10-18. 
  2. ^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". Retrieved 2011-10-18. 
  3. ^ "AESCHYNITE-(Ce)". Retrieved 2011-10-18. 
  4. ^ "Aeschynite-(Ce) (Ce, Ca, Fe, Th)(Ti,Nb)2(O, OH)6" (PDF). Retrieved 2011-10-18. 
  5. ^ "Aeschynite-(Ce)". Archived from the original on 2012-04-24. Retrieved 2011-10-18.