Aeschynite-(Ce)
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| Aeschynite-(Ce) | |
|---|---|
| General | |
| Category | Mineral |
| Chemical formula | (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 |
| Strunz classification | 04.DF.05 |
| Dana classification | 08.03.06.01 |
| Crystal symmetry | Orthorhombic |
| Unit cell | a = 11.08 Å, b = 7.56 Å, c = 5.37 Å; Z = 4 |
| Identification | |
| Molar mass | 305.70 gm |
| Color | Brown, light brown, brownish black, yellow, black |
| Crystal habit | Acicular, massive |
| Crystal system | Orthorhombic - dipyramidal |
| 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 |
| 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 for "shame". The "-(Ce)" means it has more cerium than the yttrium variety aeschynite-(Y). Its Mohs scale rating is 5-6.
[edit] References
- ^ "Aeschynite-(Ce) Mineral Data". webmineral.com. http://www.webmineral.com/data/Aeschynite-%28Ce%29.shtml. Retrieved 2011-10-18.
- ^ "Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data". mindat.org. http://www.mindat.org/min-37.html. Retrieved 2011-10-18.
- ^ "AESCHYNITE-(Ce)". http://database.iem.ac.ru/mincryst/s_carta.php?AESCHYNITE-%28Ce%29+34. Retrieved 2011-10-18.
- ^ "Aeschynite-(Ce) (Ce, Ca, Fe, Th)(Ti,Nb)2(O, OH)6". http://rruff.geo.arizona.edu/doclib/hom/aeschynitece.pdf. Retrieved 2011-10-18.
- ^ "Aeschynite-(Ce)". mineralatlas.com. http://www.mineralatlas.com/mineral%20optical%20descriptions/A/aeschyniteceopt.htm. Retrieved 2011-10-18.
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