It doesn't look like limestone, that's why I said a telluride or sulfide, which would be a number of minerals that really could only be identified by using an assay, because there are too many minerals mixed together so to speak to tell one dominate mineral. I don't know if that is the right way to explain it, but I hope that makes sense lol! Because, there could be magnatite, feldspar, bornite, calcopyrite, etc, etc, etc, all kinds of minerals in a mix. It is just too hard of a thing to be able to peg down, so an assayer will be able to analyze it, and tell if there is enough of the "target" mineral, I.E. gold silver, or "other" for it to be viable to mine. This can be good even for a hobby miner like myself! And why I have had a few ores I have found assayed!
It's just a guess! I was kind of going by what it looks like compared to what I have seen come out of mines here where I live. Telluriddes are complicated mixtures of minerals, and your pick looks like the stone has A LOT of different minerals in it. I've said it before though, I'm not an expert on this stuff, but I read a lot and have many friends who have mined professionally as well as friends at the Montana Tech, specifically at the Mineral museum. It reminds me of tellurides I have seen from Golden Sunlight mine and from the Jefferson mining district. The black in the stone could also mean there is magnesium minerals, which I believe oxidizes black? Could be mistaken on that one. At any rate, like I say, it's just a guess!
