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Yttrium Fluorite

Posted by Kristi Hugs  
Yttrium Fluorite
January 13, 2012 05:42PM
Good Morning,
I have just purchased some Yttrium Fluorite but cannot find a lot about it at all! I know that Yttrium is a rare earth inclusion and is found in just a few mineral specimens. I know that this type of Fluorite does not cleave like other Fluorites. I am pretty sure that it only comes from Mexico. So my assumption is that Yttrium Fluorite is a Var. Fluorite with Yttrium inclusions. Would that be correct? I cannot find anything on about Yttrium Fluorite specifically, so am really not sure if I am going in the right direction or not. I did look in my Peterson Field Guide of Rocks and Minerals as well as my Audubon Field Guide (North America) but did not find yttrium in either.

Any assistance you could give would be most appreciated!!

thank you,
avatar Re: Yttrium Fluorite
January 13, 2012 06:05PM
Looks more like agate to me, how hard is it? Also see this:

Edited 1 time(s). Last edit at 01/13/2012 06:06PM by Reiner Mielke.
Re: Yttrium Fluorite
January 13, 2012 06:11PM
No, it is not an agate. I am 100% sure it is Yttrium FLuorite :) it is very soft, easily scratched.
Thank you for the link, however, I am not sure they are the same. This particular lavender is found in Mexico. I did not see that in the information shared. Thanks for the help though! Every bit helps!! :)

Edited 1 time(s). Last edit at 01/13/2012 06:14PM by Mira Bai.
avatar Re: Yttrium Fluorite
January 13, 2012 06:29PM
Since this is a sliced slab difficult to determine from a picture. Hardness test would not be conclusive. I would try testing for carbonates to rule them out.

The green fluorite from the William Wise Mine is reported to have Yttrium causing the fluorescence (and perhaps other REEs).

Good luck with your search.

stephanie smiling smiley
Re: Yttrium Fluorite
January 13, 2012 06:45PM
Thank you !! I know the ID of the piece. I am 100% sure of that. What I am looking for is information on Yttrium Fluorite. Is it Fluorite with Yttrium inclusions? Is that what makes it the pale lavender color? Since it has no cleavage, is it the fluorite that is the purple color and the yttrium that is included that makes it pale? Is mexico the only source? if so, why? is there something there that there is not anywhere else in the world?

these are the kind of things I am looking for :) The ID of the piece is not in question, so I have removed it since the ID is not what I am asking for help on :) it is the content I am needing the help with :) Thanks for your input! all is helpful!!

Edited 2 time(s). Last edit at 01/13/2012 06:47PM by Mira Bai.
avatar Re: Yttrium Fluorite
January 13, 2012 06:57PM
Re: Yttrium Fluorite
January 13, 2012 07:03PM
Reiner was kind enough to post that info earlier. I am not sure they are the same due to the fact that mexico is not even listed in the locations? I will add that to my research just in case :) thanks so much!
avatar Re: Yttrium Fluorite
January 13, 2012 07:36PM
In a google search I found a metaphysical site that is selling this material.

I am providing the link as the site has pictures of the botyoidal rough material which is better for reference.

The listing indicates that 20% of the calcium has been replaced by Yttrium. Someone has tested this somewhere?

Perhaps some of the Mexican fluorite experts can shed a light on a more precise locality which may lead to published information on the fluorite analysis from there.

hope this helps
stephanie smiling smiley
avatar Re: Yttrium Fluorite
January 13, 2012 08:16PM
avatar Re: Yttrium Fluorite
January 13, 2012 09:22PM
an other healy-fealy-fake!?
Re: Yttrium Fluorite
January 13, 2012 09:32PM
No, it is not fake, Peter :) It is real. I know well respected, reputable dealers that have sold it. I am currently doing some research on old scientific papers (thanks Rock Currier!) about Yttrium. I believe I read on Google where this was only found in Mexico, however, upon further study, these particular pieces were cut from Brown's Canyon District, Colorado. I also found out that Yttrium is not an inclusion. It is, in its own right, what is called a "rare earth". There are tests on this rare earth (scientific papers) that mention Yttrium back as far as the late 1800's. As far as how and when Yttrium Fluorite was first found or if there is another more accurate name, I am still researching. Thanks for all the suggestions and help!

avatar Re: Yttrium Fluorite
January 13, 2012 09:41PM
Well, since the element Yttrium haven't been found as a native form in nature, what you have is yttrian-fluorite (and if you look at it chemicaly, you would probably never have the possibility of natural yttrium in a fluorite). But if you want to be sure, why not get it analysed?
avatar Re: Yttrium Fluorite
January 13, 2012 09:41PM
You may already have this one, but here is another paper on Colorado material.
Re: Yttrium Fluorite
January 13, 2012 09:49PM
Thank you Stephenie, that was very helpful!
Re: Yttrium Fluorite
January 13, 2012 10:24PM

I have Dana's New Mineralogy, and it mentions pale violet Fluorite from Naica Mexico, but doesn't elaborate on it. Mentions the SG of "yttrian or cerian fluorite". Can i ask what your confidence is in it's identity? i just ask because chemistry is complicated stuff. Lots of things observed aren't totally understood, so answers to good questions can be lacking, -sigh-
Take care,

Re: Yttrium Fluorite
January 13, 2012 10:36PM
There's a rock shop in Llano, Texas that has some experience with fluorite and rare-earth minerals. You can contact him at:

Enchanted Rocks & Jewelry
805 Berry St.
Llano, Texas 78643

The Central Mineral Region of Texas has numerous rare-earth localities including Yttrian & fluorites; unfortunately they are on private ranches and/or under flood control lakes. He might be able to give you some identification tests you can try.

avatar Re: Yttrium Fluorite
January 13, 2012 11:02PM
You have silicified fluorite, a mixture of silica and fluorite. Here is a picture of where it comes from in Browns Canyon near the Arkansas river.
Browns Canyon

It is more of a sedimentary fluorite in this area. It used to be mined by the ton and used as flux for the steel mill in Pueblo, Colorado. It should contain traces of yttrium only because of the nearby granite. That is, it probably fluoresces in ultraviolet light.

True yttrofluorite or "Yttrium Fluorite" will be radioactive due to trace thorium content. It is found in several of the Colorado pegmatites.

Another easy verification check for yttrofluorite is a specific gravity greater than 3.2 g/cm^3. You will find that your stuff has a S..G. less than 3.0.

This silicified fluorite is attractive. I have a couple of boulders of it in my rock garden.

-Dean Allum
avatar Re: Yttrium Fluorite
January 13, 2012 11:23PM

I can't see your pic of the specimen and I know nothing about Mexican Fluorite but if I recall correctly Colorado was part of Spanish Mexico so if you are researching old papers they may refer to the locality as being in Mexico.

Re: Yttrium Fluorite
January 13, 2012 11:25PM
I am following up with the vendor on the location since I am the one that appears to be confused on that one. The vendor I purchased this from is well respected, very knowledgeable, has been in the business for over 25 years and knows her stuff. I do not question that at all. I am 100% sure of what I have. So please, trust me when I say testing is not necessary.

My original question was, could someone tell me more about it.? I know it does not have the cleavage Fluorite is known for, in fact, I read that it has no cleavage. Whether that is true or not, I have not followed up on just yet. It is my understanding that Yttrium has replaced some of the calcium. I have been reading various scientific papers on the subject, one of which, if you are interested, you can look at. Stephanie shares the link in a previous post. I took down the original picture because people were trying to identify it. I know what it is, I do, I really do.......i just wanted to know more about it...that's all :)
open | download - Yttrium 7.jpg (315.4 KB)
Re: Yttrium Fluorite
January 14, 2012 06:47AM
I would hazard a guess that what is being sold as "yttrium fluorite" is what Dana's System of Mineralogy calls "yttrian fluorite". Merely a variety of fluorite with some calcium being replaced by yttrium (one reported analysis has the ratio Y:Ca as 1:6), with the touchy-feelies not knowing how to change the reference to the element. This old (1951) reference suggests the variety tends to be massive or granular, and colorwise is yellow, brown, violet, or blue (aren't these colors rare in fluorite????). No specific locations are cited. So, to verify that you actually have "yttrian fluorite", you would need a chemical analysis of your specimen - there is no simple test, visual or otherwise, that will tell you that a fluorite specimen contains yttrium.


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