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Serpentine, I've worked with similar material from Afghanistan.
Great thread! What can you tell me about these? They are from a hillside in Newman Lake, WA. According to my research this is in the Coeur d'Alene area of the Belts Supergroup, which is noted for its quartzite. In particular, the CDA area is noted for a glassy vitreous quartzite. And invisibly fine gold is often found in quartzite. That's all I know, and I don't know if it's right or wrong. The rocks are float, tumbling down the hillside - I haven't found the source yet. Many of them are entirely crystallized, but those that have clustered terminations are stubby and covered in something that looks powdery, but nothing removes the "powder" (not oxalic acid or muriatic acid or sandblasting or water blasting or scrubbing with brass brushes). The white rocks were simmered for days in oxalic acid, then soaked for a few weeks in muriatic acid, trying to make them pretty, but nothing really cleans them up.
So, what can you tell me about these? And might they have that elusive, invisibly fine gold? And how could I tell? And then how could I get it out?
Thanks!!
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Lol and one last p.s. get a loop, a good loop will help you to find most micro gold, don't shy away from fools gold, it contains gold, and can be an amazing way to find a lode, and finally cleaning these rocks is hard, there hard. The black is molybdenum most likely and not much eats it. I suggest a tile saw for cutting them, a textile gun for cleaning them, and a loop for observation! All three should cost no more than 100$ and all three will be worth it.
I would actually say petrified wood , with a heavy mineralization, I've found copper, pyrite, opal and other iron mineralizations, causing the same coloration, with spesertine it would come apart in very fiberous sheaths, and would also be very soft.
Thanks so much! I'm excited about spring getting here - new exploration and excavation to be done!
So I can cut them with a tile saw? I don't need an expensive lapidary saw?
Or blue peacock there! Very nice!
Sure looks like copper-minerals and god-knows-what. I hope there's a lot more of that where it came from.