Aeschynite-(Ce)
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]
| 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 | [1][2][3][4][5] |
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.
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