Aeschynite-(Ce)

Oxide mineral

Aeschynite-(Ce)

General
Category| Oxide minerals
Formula| (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
IMA symbol| Aes-Ce[1]
Strunz classification| 4.DF.05
Dana classification| 08.03.06.01
Crystal system| Orthorhombic
Dipyramidal class
Space group| 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
Identification
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
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

[edit]

* List of minerals

## References

[edit]

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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