Concretion?

Concretion?

This one looks like it has "glue" holding it together.  The gray bands appear to hold it together.  I read that this might occur with sedimentary rock.  I don't know if it occurs on this scale.  This rock is about an inch and one half long.  It is no less interesting because I don't know its identity.  This is one I plan on taking to Lowe-Volk in January to get help with ID.

Concretion?

If anyone knows, please feel free to comment.  This one has been through the first stage of  tumbling.

Concretion?

The gray material looked to be Quartz to me.  After checking the hardness, I have decided that it can't be quartz.  The Mohs' hardness is greater than 9.  It is fun to look at and wonder what it might be!

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