Mindat Logo

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.

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.

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?

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

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

Your Email:


  • Valid attachments: jpg, gif, png, pdf
  • No file can be larger than 1000 KB
  • 3 more file(s) can be attached to this message

Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: December 22, 2014 00:00:02
Mineral and Locality Search
and/or Locality:
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds