Talk:Lanthanum
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Article changed over to new Wikipedia:WikiProject Elements format by Dwmyers 15:35 Feb 28, 2003 (UTC) and Mkweise. Elementbox converted 10:44, 10 July 2005 by Femto (previous revision was that of 13:33, 9 July 2005).
[edit] Information Sources
Some of the text in this entry was rewritten from Los Alamos National Laboratory - Lantahnum. Additional text was taken directly from USGS Lanthanum Statistics and Information, from the Elements database 20001107 (via [http://www.dict.org dict.org), Webster's Revised Unabridged Dictionary (1913) (via dict.org) and WordNet (r) 1.7 (via dict.org). Data for the table was obtained from the sources listed on the subject page and Wikipedia:WikiProject Elements but was reformatted and converted into SI units.
[edit] Talk
I assume that the percentages in
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- Monazite and bastnasite are principal ores in which lanthanum occurs in percentages up to 25 percent and 38 percent respectively.
are % of total rare earth element content, right? Mkweise 20:16 Feb 26, 2003 (UTC)
- The structures of these minerals are in the cerium article now (structures, I'll note, that seem rather vague). You might pull out a calculator and check. Dwmyers 15:35 Feb 28, 2003 (UTC)
- Looking at the structures of monazite, and bastanite, it's entirely possible that lanthanum can be 25% and 38% by weight of the ore (which is what the text reads). The total metal content of these ores by weight is much greater than 50%, no matter how you slice it. Dwmyers 17:28 Feb 28, 2003 (UTC)
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- AFAIK, all significant sources of rare earths are mischmetal ores, with typically about 50% cerium, 45% lanthanum and 5% other rare earth elements. I could be wrong, though; it's been 15 years since college. I'll have a look around the USGS site. Mkweise 18:23 Feb 28, 2003 (UTC)
- Please look. I'm not a geologist, my background is in biochemistry. I'm doing this stuff because I've always liked elemental chemistry, and your interests seem complimentary to what I know. Dwmyers 19:49 Mar 2, 2003 (UTC)
- AFAIK, all significant sources of rare earths are mischmetal ores, with typically about 50% cerium, 45% lanthanum and 5% other rare earth elements. I could be wrong, though; it's been 15 years since college. I'll have a look around the USGS site. Mkweise 18:23 Feb 28, 2003 (UTC)
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- Actually I'm an electrical engineer, I just took chemistry courses out of interest :-). As far as I can tell, the percentages given are about right for the pure minerals. I did find some commercial specifications for mischmetal and found that the composition varies considerably between sources.
- Note that most ores found in nature are far from pure, but I haven't found any info relating specifically to monazite or bastnasite. I do know that many iron ore deposits are <= 20% iron as mined and has to be mechanically processed into what is called ore concentrate (around 50% iron) before smelting. Mkweise
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[edit] Block f ?
Does lanthanum really belong to block f ? It hasn't any f-electron, am I right? ;-) -- Chrumps 13 Mar 2005 (UTC)
- According to F-block: "Unlike the other blocks, the conventional divisions of the f-block follow periods of similar atomic number rather than groups of similar electron configuration. Thus, the f-block is divided into the lanthanide series and the actinide series." Femto 10:49, 10 July 2005 (UTC)
