There are lots of small hydrothermal copper zones around. People don't think of copper when you think of eastern Oregon but the sunstone even has copper crystals in it at times.
Yeah, I haven't found reports of it mined in the area (Mercury, trace gold, trace silver, and coal, yes, but not yet verification for copper mining) but there's streaks of teal and turquoise soil in road cuts and a lot of a bright blue patina in volcanic rock. Just not this bright, usually! Or soil, and crumbly, and weathered, so the moment you touch it it goes away. Lots of iron here too, and calcium. Annoying, chalky, make-your-water-taste-like-dust calcium. Some old appliances will have streaks this color blue on them, from copper that is no longer on the inside of the pipes. We're using a water softener that sequesters calcium now and more old pipes are starting to leak, because they were held together by the calcium deposits on the inside. A leak in a hot water pipe will make stalactites of calcium and verdigris.
I will try to get better pictures of the crystals in this rock. There's a faint orange layer of crystals behind the calcite or quartz, but they're tiny.