It looks a bit like a piece of granite (or rather a granitoid of some sort) or maybe gneiss. Some feldspar and some biotite. But that's just an at-a-glance impression. What about it made it stand out to you to want ID?
What stood out to me the most was how red it is all the way through but it's hard to capture that in a photo. The white vein that's going down the middle almost has a pearl essence to it. I found it in the Coeur d' Alene river in north Idaho. Here is a couple more photos. It really is beautiful.
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Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
That area is known for lots of regional metamorphism - the Idaho Emerald Creek star garnet area is to the south a ways, but still the same rock groups. Also some small granite bodies and a few pegmatites.
Knowing that, if it isn't just iron-stained mineral grains (lots of that in the region, esp. the Coeur 'd Alene mining district to the east on the south fork of the river) there is a decent chance there are bands of small garnet grains in the rock. Not really of gem value, but interesting to the one who found it...
Spent a summer in the Coeur 'd Alene district as a geological assistant (aka pack mule) on a USGS project and found lots of interesting stuff, though the best was usually in a hole a few hundred feet under ground.
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