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I find that stuff all the time on old home sites also find a lot of melted aluminum. If you have a test kit you could test it or if you can melt with a torch pretty easy you'll know it's junk.
Not a meteorite and not platinum. Neither solder nor brazing metal is magnetic. Won't melt? It's a rock. Has quartz embedded in it and it is water worn.
Hot rocks they are called Twitchy. We've got millions of them here. They set off detectors every few inches in many places. No ore or metal you could easily extract from them. Just natural rock.
The quartz embedded in your rock has been weathered before it was included. There are what appear to be small beads on the top of the non smooth side. This doesn't look natural at all. No ore I've ever seen looks this way.
If there is a metallic sheen either the material was poured in place by man (not uncommon even in out of the way places - look up babbit metal) or it has been rubbed by a metal object like a steel or brass brush. It looks like the result of molten metal dropped on the ground. If it's not magnetic and it won't melt it's got to be a rock.
If I were you I would revisit the melting aspect. With enough time under the torch I'd bet it will soften. Be careful though many of the early babbit alloys contain arsenic metal. The fumes could be a serious health hazard.