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Chert from Girard, GA (Read 327 times)

rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Chert from Girard, GA Jun 14^th, 2023 at 12:07pm	Print Post
	These are a couple of pieces which fluoresce a really pretty blue under 365nm. I have no idea what mineral this could be, any help would be appreciated.

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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4204 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: Chert from Girard, GA Reply #1 - Jun 14^th, 2023 at 5:54pm	Print Post
	Yes, I know I've seen a report on the accessory minerals in that rock somewhere? That would help to narrow the possibilities down. But Chalcedony will often times fluoresce that bright green color like the botryoidal mass in that vug. First guess would be Chalcedony, a form of Quartz or Silica.


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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #2 - Jun 20^th, 2023 at 12:20pm	Print Post
	Here are a few more. The ones with a yellowish light, a red and green light are from a headlamp I placed on the other side of the little tunnel. Not UV, but maybe interesting nonetheless.

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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4204 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: Chert from Girard, GA Reply #3 - Jun 20^th, 2023 at 8:00pm	Print Post
	Cool pics, Rob, thanks! I'm not sure what the 'blue' fluorescence might be but besides for Chalcedony some of the bright green could be 'Aragonite'. Here's a couple links. First one is a 'Cheat sheet" list for what color minerals fluoresce and the second is for the pictures. https://galleries.com/minerals/property/fluotabl.htm https://uvminerals.org/minerals/common-fluorescent-minerals/


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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #4 - Jun 21^st, 2023 at 9:18am	Print Post
	Thanks!


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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #5 - Jun 23^rd, 2023 at 12:07am	Print Post
	The blue fluorescing chalcedony (?) is so bright it's hard for me to get a picture. I'll keep fiddling with the camera and see if I can get a better result.

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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #6 - Jun 24^th, 2023 at 12:25pm	Print Post
	More chert- Seeing these rocks with the UV light I am reminded of the first time I went scuba diving and experienced the earth from an entirely different perspective.

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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #7 - Jun 24^th, 2023 at 3:56pm	Print Post
	A few more.....

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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4204 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: Chert from Girard, GA Reply #8 - Jun 24^th, 2023 at 9:57pm	Print Post
	Success! Found that old article on an earlier post on here. Most informative article I've seen on it. http://www.aikengmfs.org/PowerPoints/2012AGMF_Girard_Chert.pdf


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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #9 - Jun 25^th, 2023 at 1:58pm	Print Post
	Joe, thanks for the link! Very informative-


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rob23 Full Member Offline RockHoundLounger Posts: 127 Location: Augusta GA Joined: Jun 4^th, 2023 Gender:	Re: Chert from Girard, GA Reply #10 - Jul 2^nd, 2023 at 10:57am	Print Post
	I just love this one-

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