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Is this rock a Rhyolite? If so would it just be called an aphanitic Rhyolite?

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Welcome to the forum!

It maybe after the weekend before you get many replies, there's a NuggetShooter fall outing taking place this weekend and many of those attending will get there a couple of days early, meaning that some are already out in the field for the outing and may not be back on the forum until after the weekend. 

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I'm with Bob on this one.  Just from the photos, it looks like an impure meta-quartzite to me.

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