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Lime Green Minerals (Found in CT in beryl mines)

Posted by Daniel jacobs  
Daniel jacobs June 10, 2012 09:05PM
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.
open | download - lime.jpg (140.8 KB)
open | download - lime2.jpg (108.5 KB)
open | download - lime3.jpg (41.9 KB)
Stephanie Martin June 10, 2012 09:34PM
George Creighton June 10, 2012 09:42PM
Might be shards of chrysoberyl, but need to know the hardness as Stephanie requested.

Good luck and welcome to the forum.

Regards george
Amanda Hawkins June 10, 2012 09:52PM
They look like Peridot to me :-)

Daniel jacobs June 11, 2012 12:06AM
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.
Rowan Lytle June 11, 2012 12:28AM
did you collect them? if so, PM me exactly where from and I can tell you what they might be.

-Rowan Lytle

Food, Water, Shelter, Fire, Minerals.
Paul Brandes June 11, 2012 03:40AM
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.
Daniel jacobs June 11, 2012 03:51AM
I tried searching at the specific mines that I went to, but there are very few pictures uploaded. Ill do a little more research
Stephanie Martin June 11, 2012 04:00AM
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.

stephanie :-)
Daniel jacobs June 11, 2012 04:03AM
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 ;-)
John Stolz June 11, 2012 05:36AM
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.
Daniel jacobs June 11, 2012 05:44AM
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 06:00AM by Daniel jacobs.
Jeremy A. Zolan June 11, 2012 08:25AM
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!
Jim Bean June 12, 2012 04:43PM
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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