Difference between revisions of "Fluocerite-(Ce)"
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| mohs = 4½–5 | | mohs = 4½–5 | ||
| luster = waxy | | luster = waxy | ||
| − | | refractive = | + | | refractive = ''n''<sub>ω</sub> = 1.612–1.618<br/>''n''<sub>ε</sub> = 1.607–1.611 |
| opticalprop = | | opticalprop = | ||
| − | | birefringence = | + | | birefringence = ''δ'' = 0.005–0.007 |
| pleochroism = | | pleochroism = | ||
| streak = yellowish white | | streak = yellowish white | ||
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| − | '''Fluocerite-(Ce)''', is the [[cerium]]-rich form of fluocerite, a mixed [[fluoride]] of cerium and [[lanthanum]].<ref name="WebMineral"/><ref name="MinDat"/> | + | '''Fluocerite-(Ce)''', is the [[cerium]]-rich form of fluocerite, a mixed [[fluoride]] of cerium and [[lanthanum]]: samples tend to have [[amount fraction]]s of cerium and lanthanum of about 0.9 and 0.1 respectively. It was discovered in 1845 in Broddbo, in Sala municipality, Sweden ({{coord|58.724738|N|15.771217|E|alt=58° 43′ N, 15° 46′ E}}), although [[Jöns Jacob Berzelius]] may have described it in 1818 under the name of ''Neutralt flussspatssyradt''.<ref name="WebMineral"/><ref name="MinDat"/> |
==See also== | ==See also== | ||
Latest revision as of 10:20, 4 December 2009
| Fluocerite-(Ce) | |
|---|---|
| General | |
| Category | Fluoride minerals |
| Chemical formula | (Ce,La)F3 |
| Strunz classification | 03.AC.15 |
| Dana classification | 09.3.4.1 |
| Crystal symmetry | 6/m 2/m 2/m |
| Identification | |
| Color | pale yellow, yellowish brown, reddish brown |
| Crystal habit | massive |
| Crystal system | hexagonal |
| Cleavage | perfect on {001} |
| Fracture | brittle |
| Mohs scale hardness | 4½–5 |
| Luster | waxy |
| Streak | yellowish white |
| Diaphaneity | transparent to transluscent |
| Specific gravity | 6.13 |
| Refractive index | nω = 1.612–1.618 nε = 1.607–1.611 |
| Birefringence | δ = 0.005–0.007 |
| Other characteristics | radioactive (> 70 Bq/g) |
| References | [1][2][3] |
Fluocerite-(Ce), is the cerium-rich form of fluocerite, a mixed fluoride of cerium and lanthanum: samples tend to have amount fractions of cerium and lanthanum of about 0.9 and 0.1 respectively. It was discovered in 1845 in Broddbo, in Sala municipality, Sweden (58° 43′ N, 15° 46′ E), although Jöns Jacob Berzelius may have described it in 1818 under the name of Neutralt flussspatssyradt.[1][2]
See also
References
- ↑ 1.0 1.1 Fluocerite-(Ce), <http://webmineral.com/data/Fluocerite-%28Ce%29.shtml> (accessed 4 December 2009), WebMineral.com.
- ↑ 2.0 2.1 Fluocerite-(Ce), <http://www.mindat.org/show.php?id=1567> (accessed 4 December 2009), MinDat.org.
- ↑ Cheetham, A. K.; Fender, B. E. F.; Fuess, H.; Wright, A. F. A powder neutron diffraction study of lanthanum and cerium trifluorides. Acta Crystallogr., Sect. B: Struct. Sci. 1976, 32, 94–97.
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