Aeschynite-(Ce)

Aeschynite-(Ce)
General
CategoryOxide minerals
Formula
(repeating unit)		(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
IMA symbolAes-Ce[1]
Strunz classification4.DF.05
Dana classification08.03.06.01
Crystal systemOrthorhombic
Dipyramidal class
Space groupH-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[2][3][4][5][6]

Aeschynite-(Ce) (or Aschynite, Eschinite, Eschynite) is a rare earth mineral of cerium, calcium, iron, thorium, titanium, niobium, oxygen, and hydrogen with chemical 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.[7]

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

See also

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ "Aeschynite-(Ce) Mineral Data". webmineral.com. Retrieved 2011-10-18.
  3. ^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. Retrieved 2011-10-18.
  4. ^ "Aeschynite-(Ce)". Retrieved 2011-10-18.
  5. ^ "Aeschynite-(Ce) (Ce, Ca, Fe, Th)(Ti,Nb)2(O, OH)6" (PDF). Retrieved 2011-10-18.
  6. ^ "Aeschynite-(Ce)". mineralatlas.com. Archived from the original on 2012-04-24. Retrieved 2011-10-18.
  7. ^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. Retrieved 2018-11-18.


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