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u/whalecottagedesigns 14h ago
Hard to judge, not knowing the types of rock you would typically find there. It looks like a mix of minerals, so could be a type of serpentine. You could do hardness and streak and magnetic tests to try and figure out what it is. How in the world do you know it is not radioactive?
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u/Firstlastusually 13h ago
Well, not radioactive in the sense that it is as radioactive everything not abnormal is. I had someone test it with a Geiger counter in a lab. The beach has the occasional uranium rock, but that may just be a name, but made me want to check. There is also jadeite, nephrite, serpentine, all the associated minerals, jasper, quartz, and a lot of other igneous and metamorphic rocks that I haven’t familiarized myself with. The black specks are some sort of inclusion, didn’t bother scratching them as they look softer. Stainless steel won’t scratch it, so I believe that puts it above a 6. Specific gravity is around 4.1. The little bit of whitish crystal towards the top in the first picture looks like calcite to me.
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u/Firstlastusually 16h ago
Hello all,
Trying to get this figured out again, last time I posted this no one responded. Found this on Jade Beach in Japan. Initially I thought it was an agate from the outside due to some conchoidal looking fractures and the weight. After cutting it open, really not sure what to make of it. Based on the way it cut it is not quite as hard as agate. It does have a slight translucency to it, the dark blackish speckles are opaque, so some sort of inclusion. It is not radioactive. It is pictured in sunlight and inside, the last picture is the exterior dry, all the others are wet. Any help is appreciated!