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 Post subject: Curious
PostPosted: Sat Oct 31, 2020 5:23 am 
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Can anyone tell me what this is?


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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 12:55 pm 
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I've moved this thread to a more appropriate section. It is not a Forum Disclaimer. cough cough.


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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 1:04 pm 
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Hard to tell from the picture. It does look like a hunk of iron stained quartz a little bit.


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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 1:14 pm 
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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?

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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 1:45 pm 
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Do you have any info about it? Where it was found, how you came in possession of it? Anything?

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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 1:59 pm 
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With rocks like this is you are not sure what it is, just take it for Granite. :lol:


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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 2:12 pm 
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:smt105 You're killing me here Steve.


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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 3:37 pm 
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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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 Post subject: Re: Curious
PostPosted: Mon Nov 02, 2020 6:59 pm 
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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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