[Rockhounds] BASIC geo-chem question...

[Alan Goldstein]

Dennis and anyone else interested:

There is a good publication on fluorine resource in the United States available from the USGS. I used it when researching my article on the IL-KY fluorspar district that was published in the Mineralogical Record in 1997.

https://pubs.er.usgs.gov/publication/pp933

It should answer your questions. 

Alan G.

-----Original Message-----
From: Rockhounds <rockhounds-bounces at rockhounds.drizzle.com> On Behalf Of Dennis Buffenmyer
Sent: Tuesday, January 28, 2020 1:28 PM
To: Rockhound List <rockhounds at rockhounds.drizzle.com>
Subject: [Rockhounds] BASIC geo-chem question...

I live in an area where the rock units are largely sedimentary and specifically, for the most part, limestone. Within the limestone there is  not a LOT of variety of minerals, but often we find Fluorite. I understand that minerals can precipitate and form in the ooze of the sediment by concentration, chemical reactions, salinity, and ph. What I am curious about is, was the fluorite always present in diluted amounts in the limestone, or where did the fluorine originate? Was it present as HF and reacted with the Ca of the limestone?? Just curious if anyone has any knowledge of this. NOT looking for an absolute, but perhaps a predominance of occurrence??


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