Aeschynite-(Ce)

Aeschynite-(Ce)
Aeschynite-(Ce)
General
Category	Oxide minerals
Formula; (repeating unit)	(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
Strunz classification	4.DF.05
Dana classification	08.03.06.01
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
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

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] The IMA symbol is Aes-Ce.^[7]

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

References[]

^ "Aeschynite-(Ce) Mineral Data". webmineral.com. Retrieved 2011-10-18.
^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. Retrieved 2011-10-18.
^ "AESCHYNITE-(Ce)". Retrieved 2011-10-18.
^ "Aeschynite-(Ce) (Ce, Ca, Fe, Th)(Ti,Nb)2(O, OH)6" (PDF). Retrieved 2011-10-18.
^ "Aeschynite-(Ce)". mineralatlas.com. Archived from the original on 2012-04-24. Retrieved 2011-10-18.
^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. Retrieved 2018-11-18.
^ Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.

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[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.

[7] Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.

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