cyc
off to a rocking start
Member since June 2019
Posts: 4
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Post by cyc on Jun 14, 2019 18:57:36 GMT -5
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stonemon
Cave Dweller
Member since January 2017
Posts: 1,024
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Post by stonemon on Jun 14, 2019 19:26:26 GMT -5
I cannot help with the id on this one but welcome to the forum from western Oregon!
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cyc
off to a rocking start
Member since June 2019
Posts: 4
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Post by cyc on Jun 14, 2019 19:34:13 GMT -5
I cannot help with the id on this one but welcome to the forum from western Oregon! Thank you for the shoutout! I am hoping to post my intro post soon. Lifelong amateur here ("rocks are pretty"), but I've fallen down the rabbit hole again recently, and might be getting in deeper thanks to this place
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stonemon
Cave Dweller
Member since January 2017
Posts: 1,024
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Post by stonemon on Jun 14, 2019 21:29:49 GMT -5
Check for hardness and acid reaction. Might be calcite. It will sometimes fluoresce orange in long wave....
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Post by Rockoonz on Jun 15, 2019 12:04:56 GMT -5
Has a calcite look to me too, if so a steel knife blade will easily scratch the white areas and a drop of white vinegar will bubble a little.
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cyc
off to a rocking start
Member since June 2019
Posts: 4
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Post by cyc on Jun 15, 2019 13:59:42 GMT -5
Vinegar did not cause bubbles, and no scratches happened with a steel blade. Here is a better photo of the opalescence - it's submerged in water. I also just noticed this banding along the side!
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fuss
spending too much on rocks
Member since October 2018
Posts: 250
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Post by fuss on Jun 15, 2019 19:06:28 GMT -5
the banded area is chalcedony which will fluoresce green typically, so this rock could also have possibly sodalite or another feldspathoid mineral in it. I know its hard to photograph using a UV light, but better photos showing the fluorescence would be helpful. Interesting rock.
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Post by pauls on Jun 16, 2019 3:11:44 GMT -5
I have some Agates that fluoresce yellow, Some Opal also fluoresces.
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cyc
off to a rocking start
Member since June 2019
Posts: 4
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Post by cyc on Jun 21, 2019 9:42:10 GMT -5
the banded area is chalcedony which will fluoresce green typically, so this rock could also have possibly sodalite or another feldspathoid mineral in it. I know its hard to photograph using a UV light, but better photos showing the fluorescence would be helpful. Interesting rock. After some thinking, I figured out how to get better pics. I put a UV-filtering sunglasses lens over my phone camera, which filtered out the majority of the reflected blacklight and not the fluorescence! Hopefully these help. The entire inside area glows, as though it's got fire inside. To your feldspar comment, the areas with orange fluorescence are slightly grey tinted in normal light (but transparent), which reminds me of the shade of labradorite.
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fuss
spending too much on rocks
Member since October 2018
Posts: 250
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Post by fuss on Jun 21, 2019 16:33:44 GMT -5
It looks like it could be a feldspathoid mineral such as sodalite based on the color of the orange fluorescence, but its not likely to occur in the same rock with chalcedony so... I'm not really sure, you would need to nail down the hardness of the mineral that fluoresces as well as check again with a stronger acid such as dilute hydrochloric, or if all you have is vinegar you need to observe it for a bit it may only produce intermittent bubbles rather than aggressively fizz like hcl would.
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