Post subject: New Emerald Locality in Southrn California
Posted: Fri Aug 20, 2021 10:59 pm
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Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
This is right in your backyard 1bwana1, right? We're expecting a guided tour.
Aaron J. Celestian and Richard Edley for G&G wrote:
Located about 60 miles east of San Diego, a new emerald deposit has been discovered in the Julian Mining District (figure 1). This area is known for pegmatite mines and hydrothermal mineral deposits; however, none of those are known to have produced emeralds to date. The emeralds (example shown in figure 2) were all collected by author RE and son Bruce Edley near the surface and are embedded in a biotite schist host rock. Most of the recovered single crystals have a translucent dark green color and inclusions, and they are typically smaller than 2 cm. A few light-colored green beryl crystals have been recovered from a nearby pegmatite. Their formation was likely correlated with metamorphic and hydrothermal processes associated with regional tectonism.
Very cool! First the several in NC, then that little one in Montana and now California. I'm sure I am forgetting some other small US emerald locale here too.
Thanks daniele. I would be more inclined to call that green beryl than emerald. I have collected better specimens myself at Railway Dyke in Washington.
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Post subject: Re: New Emerald Locality in Southrn California
Posted: Wed Oct 27, 2021 12:25 pm
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Joined: Sun Mar 11, 2007 10:03 pm Posts: 341 Location: San Diego
I'm in that area all the time as my parents live about 10 miles away in Ramona and would love to visit, however I do not know any of the mining claim owners in that area and it is all private land.
1bwana1 - If you end up going, please shoot me a message and I'll happily tag along and bring refreshments
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Post subject: Re: New Emerald Locality in Southrn California
Posted: Wed Oct 27, 2021 9:56 pm
Gold Member
Joined: Thu May 12, 2016 2:18 am Posts: 1542
Paul,
I sense a field trip coming. Lets find out where it is and go. I love finding new deposits.
I will start making some inquiries with the local mineral hounds.
Maybe Greg is in too?
My instincts say that we will be looking for the Emerald in a contact zone between the Julian Schist, and a pegmatite intrusion. Probably in and area with coarse grain Biotite mineralization.
Just the kind of thing my portable RAMAN Spectrometer was designed for.
Post subject: Re: New Emerald Locality in Southrn California
Posted: Thu Oct 28, 2021 1:33 am
Gold Member
Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Unless it is in the Gem Trails of Southern California I am not much help in locating a Emerald from a schorl, geologically speaking. I can most definitely carry water, have a couple of Horst's mining picks. I know someone that might be of help, I am sure both of you know who he is. I'll reach out to him and see what he knows.
Post subject: Re: New Emerald Locality in Southrn California
Posted: Thu Jun 02, 2022 11:43 am
Gold Member
Joined: Thu May 12, 2016 2:18 am Posts: 1542
All,
We have been unable to locate the deposit so far. But one of my students (also currently just the final away from getting his GG), just bought a house and has moved to Julian. It is #1 on our list to find out where this deposit is and do a field trip. I will keep everyone posted.
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