Aeschynite-(Ce)

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 αισχύνη ("aeschyne") for "shame" because early chemists had difficulty with separations of titanium from zirconium.[6]

Aeschynite-(Ce)
General
CategoryOxide minerals
Formula
(repeating unit)
(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
Strunz classification4.DF.05
Dana classification08.03.06.01
Crystal systemOrthorhombic
Dipyramidal class
Space groupOrthorhombic
H-M symbol: (2/m 2/m 2/m)
Space group: Pmnb
Unit cella = 11.08, b = 7.56
c = 5.37 [Å]; Z = 4
Identification
Formula mass305.70 g/mol
ColorBrown, light brown, brownish black, yellow, black
Crystal habitAcicular, massive
CleavageNone
FractureBrittle - conchoidal
TenacityBrittle
Mohs scale hardness5 - 6
LusterAdamantine, resinous to waxy, sub-metallic; dull when altered
StreakNearly black to brown
DiaphaneityTransparent to translucent
Specific gravity4.52
Density5.19
Optical propertiesIsotropic when metamict
Refractive index2.26
Other characteristics Radioactive
References[1][2][3][4][5]

The "-(Ce)" means it has more cerium than the yttrium variety aeschynite-(Y). Its Mohs scale rating is 5–6.

References

  1. "Aeschynite-(Ce) Mineral Data". webmineral.com. Retrieved 2011-10-18.
  2. "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. 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)". mineralatlas.com. Archived from the original on 2012-04-24. Retrieved 2011-10-18.
  6. "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. Retrieved 2018-11-18.
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