Aeschynite-(Ce)
Appearance
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 | ![]() |
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 αισχύνη ("aeschyne") for "shame" because early chemists had difficulty with separations of titanium from zirconium.[6]
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.