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

[mope540]

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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[Jim in Idaho]

Looks like it might be a chalcedony nodule. Can you see light through it?
Jim

 

[mope540]

Looks like it might be a chalcedony nodule. Can you see light through it?
Jim

yes, when looking through the thinnest area.

 

[Eu_citzen]

A freshly exposed area would help. Chip off a bit with a hammer, use eye protection! Quartz often has a glassy to greasy appearance.

 

[mope540]

Eu'...here's a pic of a chipped spot.

 

[DDancer]

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.