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Lime Green Minerals (Found in CT in beryl mines)

Posted by Daniel jacobs  
Lime Green Minerals (Found in CT in beryl mines)
June 10, 2012 08:05PM
These were recovered from a beryl mine in the middlesex county area of Connecticut. (Portland or East Hampton)

They are lime green in color

I dont know if they are part of the beryl, but I would think not because the beryl recovered was either golden or more emerald in color.
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open | download - lime2.jpg (108.5 KB)
open | download - lime3.jpg (41.9 KB)
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 10, 2012 08:34PM
    
Hardness?
Re: Lime Green Minerals (Found in CT in beryl mines)
June 10, 2012 08:42PM
    
Might be shards of chrysoberyl, but need to know the hardness as Stephanie requested.

Good luck and welcome to the forum.

Regards george
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 10, 2012 08:52PM
    
They look like Peridot to me smiling smiley

Amanda
Re: Lime Green Minerals (Found in CT in beryl mines)
June 10, 2012 11:06PM
Stephanie Martin Wrote:
-------------------------------------------------------
> Hardness?


I dont know much about hardness, but I did a little research on the hardness scale and checked to see if it could scratch quartz(7), and it could not, I tested it on a piece of green calcite(3), and it did scratch it. Then I tested it on Fluorite(4), and it also scratched it.
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 10, 2012 11:28PM
    
did you collect them? if so, PM me exactly where from and I can tell you what they might be.

-Rowan Lytle

Necessities:
Food, Water, Shelter, Fire, Minerals.
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 02:40AM
They look a lot like the peridot you find in the San Carlos basalts in Arizona.

Daniel, you may want to do a mineral search on Mindat to see if any of these potential minerals occur in Connecticut and if any are near you.
Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 02:51AM
I tried searching at the specific mines that I went to, but there are very few pictures uploaded. Ill do a little more research
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 03:00AM
    
The hardness test you did rules out chrysoberyl (which is confirmed found in Connecticut) and any mineral that is harder than quartz. Without a good crystal termination or cross section it is difficult to determine. An SG test would be useful in this situation. Perhaps even a streak test? Hopefully Rowan will be able to nail it for you.

regards,
stephanie smiling smiley
Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 03:03AM
It really does look like peridot to me.... however. There are no such occurrences of peridot in connecticut. Perhaps I am the first? I do have a good eye winking smiley
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 04:36AM
    
I thought Peridot also, ut purely from color which isn't very reliable. You need more data points. Try a pen knife (hardness 5.5) and a steel file (7) to get a better idea. Peridot is around 7.
Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 04:44AM
John Stolz Wrote:
-------------------------------------------------------
> I thought Peridot also, ut purely from color which
> isn't very reliable. You need more data points.
> Try a pen knife (hardness 5.5) and a steel file
> (7) to get a better idea. Peridot is around 7.

Hmmmm. Since you said that I tested it on pyrite (6.5 - 7) and the mineral couldnt scratch the pyrite cube or quartz.

the pyrite couldnt scratch the mineral back... BUT quartz did leave a faint mark.

I retested it on Fluorite(4) and the mineral DID scratch the fluorite(4).

So the hardness must be between 6-7...



Edited 1 time(s). Last edit at 06/11/2012 05:00AM by Daniel jacobs.
Re: Lime Green Minerals (Found in CT in beryl mines)
June 11, 2012 07:25AM
The occurrence of peridot in a felsic pegmatite seems unlikely to me however I agree that the proposed identity of this mineral seems fairly accurate. Be careful, as it may very well be a specimen with a foreign origin that was disposed of at the collecting site. This situation is commonly encountered and can make things quite confusing both mineralogically and geologically!
avatar Re: Lime Green Minerals (Found in CT in beryl mines)
June 12, 2012 03:43PM
    
Beryl, in between green and golden would be my guess based on the (typically inexact) hardness tests and color. I agree with Jeremy, a beryl-bearing pegmatite is a highly unlikely environment for peridot.
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