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Experts...What type of rock is this??

mope540

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Location
Missouri
Detector(s) used
Sovereign XS, E-Trac, Equinox 800, Manticore.
Oldest coin to date...1829 large cent
Primary Interest:
All Treasure Hunting
Please ID this creek find. Going by the chipped areas, I suspect that this rock has quartz crystals inside.
Thanks for any info
 

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Looks like it might be a chalcedony nodule. Can you see light through it?
Jim
 
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A freshly exposed area would help. Chip off a bit with a hammer, use eye protection! Quartz often has a glassy to greasy appearance.
 
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Eu'...here's a pic of a chipped spot.
 

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Appears to be a fine quartz/ chalcedony nodule. If you cut it then it may exhibit banding like agate but I suspect it would have a grainy appearance. I have found lots of that type of rock and find them neat because of the shapes ;) The dark bit in the chip photo is smoky quartz crystal.
 
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