Did I find an opal?

Fossil_adult

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Apr 9, 2021
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I don?t have any idea what this rock might be, but I?m thinking it?s an opal. Any experts can chime in if they want to. I found it at prehistoric trackways national monument along with some shell fossils and some trackways from prehistoric amphibians (no I didn?t take any out of the monument I collected right outside of the boundary of the monument which is BLM lands). Here?s some pictures. C2269B78-75BC-4D34-92E4-1AFDC2E757C3.jpeg 630290CE-DEBE-448F-927B-5FC7E51568C1.jpeg The rock on the left is the alleged opal in question. The rocks in red contain trackways from over 290 mya. 40003191-2051-438D-8AA0-70C43C0FC5A9.jpeg E3C44007-A72D-4EEC-A8B2-5F7D699AA1F7.jpeg 48D70BC8-4029-449B-AA97-D9D011990DE9.jpeg 242C65B5-E54E-4C9A-8ED6-929D29EBFEE3.jpeg it really is fun finding these sorta things. I consider the trackways to be some of my best in my collection to date. Any tips on the rock would also be appreciated.
 
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Fossil_adult

Jr. Member
Apr 9, 2021
65
237
Detector(s) used
Got a Chinese knockoff brand off Amazon. Now I don’t know how to use it or where to even begin.
Primary Interest:
All Treasure Hunting
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Those pictures came out garbage. Here’s some better ones. 080B4437-D0DE-4EF3-9334-427CE5611F11.jpeg 26400BE7-495D-48B2-B645-4CD9FF0A07BB.jpeg
 
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Charlie P. (NY)

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I think it is agate or brown jasper. But I really can't tell. An opal is like an agate that never crystalized. They are made of up to 30% water
 
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Fossil_adult

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Apr 9, 2021
65
237
Detector(s) used
Got a Chinese knockoff brand off Amazon. Now I don’t know how to use it or where to even begin.
Primary Interest:
All Treasure Hunting
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An agate might make sense, after all, there were volcanoes here also with tons of igneous rock.
 
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Kray Gelder

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It looks like it could be common opal, or quartz. If you can scratch it with a pocket knife, it's probably opal. Also, opal is quite a bit lighter than quartz. Opal is frequently found in volcanic basalt and ash deposits.
 
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ToddsPoint

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Mar 2, 2018
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Does your possible opal have the rainbow colors? Here are some opals and you can see the rainbow colors in some. These are jelly opals from Mexico. Gary

DSC09168.JPG DSC09169.JPG
 
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Fossil_adult

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Apr 9, 2021
65
237
Detector(s) used
Got a Chinese knockoff brand off Amazon. Now I don’t know how to use it or where to even begin.
Primary Interest:
All Treasure Hunting
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No rainbow colors that I see but its a strange colored rock nonetheless. I shone a light through it and it only emits the light itself I don't see any colors popping out.
 
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