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Charlesite? Franklin NJ

Posted by Modris Baum  
Charlesite? Franklin NJ
May 18, 2012 04:24PM
    
Click the photo TN at top for more info.

Franklin experts - any ideas?

Thanks - Modris
Re: Charlesite? Franklin NJ
May 23, 2012 01:06AM
Charlesite is fluorescent and so is Clinohedrite, although not all clinohedrite is fluorescent. Matrix looks like axinite? I can't see the hexagonal symmetry but that is probably do to my eyes and the photo so I lean towards clinohedrite and quite possibly datolite. Put a UV lamp on it.

Peter
Re: Charlesite? Franklin NJ
May 23, 2012 01:19AM
    
Hi Peter,

Well - I did try UV. That's how I knew it wasn't willemite (of which there are a few rather strangely shaped "xls" in this material). But I didn't see any response at all - neither orange clinohedrite nor blue charlesite nor cream from a gypsum coating. But I concluded that the thing was just too small to tell (except for no willemite of course).

Anyway - thanks for the input. It's nothing important - just trying to empty out my UK boxes.

Modris
Re: Charlesite? Franklin NJ
May 23, 2012 03:10AM
Take a look at Fig 140 of Palache. Datolite?
Re: Charlesite? Franklin NJ
May 23, 2012 03:28AM
    
Hi Peter,

Well - Fig 140 is a pretty complex crystal so you'd have to simplify it to match this guy.

But the main problem I have in thinking datolite is that (in my experience) the datolite xls in this environment are very glassy and nearly transparent. The one charlesite that I do have (a much larger xl that was kindly glued next to a clinohedrite by one of the previous owners) is opaque. Of course that's probably due to the gypsum coating.

Anyway - don't knock yourself out. It's not that important. But maybe I'll take a crack at exposing the xl better. What have I got to lose?

Modris
Re: Charlesite? Franklin NJ
May 23, 2012 10:37AM
    
My impression is that it is a datolite.

Chet
Re: Charlesite? Franklin NJ
May 23, 2012 03:47PM
    
Chet & Peter

OK. I'm being convinced. If you simplify Fig 140 it does resemble my xl.

I don't think I'm going to post it as datolite - it's not exactly a good example! But I think I can take one more thing out of the UK boxes.

Thanks - Modrisd
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