Have created mo rhyolite threads a few times, tried a couple pics earlier though and maybe they are better than before though my camera and or cam. skills doesn't show material well enough and almost seems like people would have to see in person. Its Brown yes but its also a dark reddish color and has a purple "hue". The sunlight brings out the purple and its a bit overcast in pics from clouds but any brighter makes the pic bad. It is an igneous made material and comes from the area of the highest point in Missouri (st. francois mountains) in the eastern ozarks. There has been points made of this material travel over 50 miles and even further almost into arkansas.
Some pics and links.
ST Francois Mountains/wiki
Rhyolite link
Some pics and links.
ST Francois Mountains/wiki
Rhyolite link
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