Ironstone

Ironstone From Queensland Australia

As you might notice, this ironstone and others resemble sandstone because they are.  The color comes from iron.  This sample is from Queensland Australia.  It that region is associated with Gold, Silver and copper mining.

Ironstone From Queensland Australia

It is banded because it is a sedimentary rock, formed by deposits on the seafloor.  

Ironstone From Queensland Australia

The banding becomes more visible as we zoom out.  I think the white specks are probably quartz.

Ironstone From Queensland Australia

I learned that ironstone sometimes hosts opal concretions from the the tag on which the sample was mounted and from reading in Wikipedia.

Ironstone From Queensland Australia

I considered it like a geode.  I had to open it to look for opal.  I used a chisel based on recommendations from a knowing friend but I found no opal.

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