[Rockhounds] REE -

[Glenn Wimpee]

Why "so-called"? Isn't Terlingua a real locality?
Glenn 



 EMAILING FOR THE GREATER GOODJoin me

> From: axel.emmermann at pandora.be> To: rockhounds at lists.drizzle.com> Subject: RE: [Rockhounds] REE - > Date: Mon, 7 Jul 2008 21:51:51 +0200> > Indeed my friend!> Cerium is also a good replacement for Mn2+ in fluorescent calcite... The> so-called Terlingua Type Calcite.> Beautiful pink fluorescence under LW-UV.> > Greetzzzz > Axel> > > -----Oorspronkelijk bericht-----> > Van: rockhounds-bounces at lists.drizzle.com > > [mailto:rockhounds-bounces at lists.drizzle.com] Namens Rik Dillen> > Verzonden: maandag 7 juli 2008 19:35> > Aan: 'Rockhounds at drizzle.com: A mailing list for rock and gem > > collectors'> > Onderwerp: RE: [Rockhounds] REE - > > > > REE are even used in some very special steel qualities nowadays.> > One of the purposes is to use it as a scavenger for sulfur. > > Manganese is used for that traditionally, but MnS has in some > > steel grades the tendency to form large flaky pancake-like > > structures underneath the steel skin, which, in certain > > cases/circumstances might give rise to flake formation. > > Cerium sulfide on the contrary forms very small, hard > > spherical precipitates instead, which improves steel quality. > > The big drawback is the price, of course (in the steel > > industry they don't need grams, but many tons).> > > > Grts,> > > > Rik DILLEN> > Doornstraat 15,  B-9170 Sint-Gillis-Waas Belgium E-mail > > rik.dillen at skynet.be Homepage : http://users.skynet.be/rik.dillen > > > > > > -----Original Message-----> > From: rockhounds-bounces at lists.drizzle.com > > [mailto:rockhounds-bounces at lists.drizzle.com] On Behalf Of > > Ronald Werner> > Sent: Sunday, July 06, 2008 11:36 PM> > To: rockhounds at lists.drizzle.com> > Subject: [Rockhounds] REE - > > > > Sorry Kreigh, but some correction is needed here!> > > > REE are to my best knowledge NOT used for doping > > semiconductors. That's the privilige of the group III and V elements.> > > > Tim is of course absolutely right: REE's are not rare at all! > > They are rather abundant, though concentrated in economic > > quantities in a limited number of deposits only. > > > > China seems to have most of the reserves, but the Mountain > > Pass deposit in California is a major reserve base for the US.> > > > No, we won't run out of REE's in ten years. It will take > > much, much longer, and before that we will have run out of > > many other elements.> > > > REE's are of strategical importance in numerous high-tech and > > defence applications. > > > > Also in our daily life we have become rather dependant on > > these phantastically interesting metals. Especially in > > optical and magnetical applications they are of great importance.> > > > Yes, REE's are boring by appearance, and early scientists had > > good reasons to call them "rare earths". The mixtures of > > oxides early scientists managed to prepare were typically > > earth-like brownish.> > > > The pure oxides of some are actually quite nice, cerium-oxide > > being nice yellowish and neodymium-oxide light pink. > > > > I guess modern purists would gladly get rid of such ancient > > terms like REE's and would rather speak of the lanthanides, > > thereby excluding yttrium, and technically seen also lutetium.> > > > I am more a romanticus and will always speak of the REE's and > > include yttrium and lutetium, and will even mention scandium > > as being rather close to the family.> > > > Good samples of the classic REE's minerals -aeschynite, > > euxenite, fergusonite, polycrase etc.- from norwegian > > deposits have already become expensive and hard to find.> > > > Samples of the REE-containing minerals that constitute > > present day ore are as far as I know basically without any > > significance for collectors. I believe the Mountain Pass ore > > consists mainly of corns of bastnäsite. Anyone who has ever > > seen a good crystal, please DO correct me!> > > > Regards,> > > > Ronald Werner> > Norway> > > > > > > > > > > > --------------------------------------------------------------> > -----------> > Få din egen, gratis e-postadresse på Start.no> > > > --> > _______________________________________________> > Rockhounds at drizzle Mailing List> > Subscription Services:> > http://lists.drizzle.com/mailman/listinfo/rockhounds> > List Home Page, with a link to the List Usage Policy:> > http://www.eclecticlapidary.com/Rockhounds/index.html> > > > > > -- > > _______________________________________________> > Rockhounds at drizzle Mailing List> > Subscription Services:> > http://lists.drizzle.com/mailman/listinfo/rockhounds> > List Home Page, with a link to the List Usage Policy:> > http://www.eclecticlapidary.com/Rockhounds/index.html> > > > > -- > _______________________________________________> Rockhounds at drizzle Mailing List> Subscription Services:> http://lists.drizzle.com/mailman/listinfo/rockhounds> List Home Page, with a link to the List Usage Policy:> http://www.eclecticlapidary.com/Rockhounds/index.html

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