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]
| Aeschynite-(Ce) | |
|---|---|
| General | |
| Category | Oxide minerals |
| Formula (repeating unit) | (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] |
The "-(Ce)" means it has more cerium than the yttrium variety aeschynite-(Y). Its Mohs scale rating is 5–6.
See also
editReferences
edit- ^ 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.
- ^ "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.
{{cite web}}: CS1 maint: unfit URL (link) - ^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. Retrieved 2018-11-18.