jero
off to a rocking start
Member since September 2009
Posts: 11
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Post by jero on Oct 12, 2009 22:30:59 GMT -5
From the Chain of Rocks gravel bar, Mississippi River at Granite City, IL (north of St. Louis, MO) Not wet, polished, or even washed! 1. These are all the same rock. I can't quite capture the colors. The red seems slightly translucent. The cream colored coating is opaque. The shiny part on the bottom is translucent and honey to olive colored when held to the light. Group 2 Color problem again, too much red in the pic. Group 3 Any help appreciated! Later, jeri
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MikeS
fully equipped rock polisher
Member since January 2009
Posts: 1,081
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Post by MikeS on Oct 14, 2009 18:02:08 GMT -5
group 1 and 2 appear to be chert
not sure on group 3...the one in the middle is perhaps some form of quartzite...
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jero
off to a rocking start
Member since September 2009
Posts: 11
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Post by jero on Oct 15, 2009 22:17:01 GMT -5
Thanks mikes for taking the time to post your thoughts!
I've been picking up rocks all my life and have never been sure what they are.
Later, jeri
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MikeS
fully equipped rock polisher
Member since January 2009
Posts: 1,081
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Post by MikeS on Oct 15, 2009 22:26:39 GMT -5
any time
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