Brown jasper and ….?

[Blackfoot58]

I found quite a lot of brown jasper in a nearby creek. Most were smooth, waxy looking all over. This one seems to have a different rock/mineral mixed into it.
The brown areas cannot be scratched with a SS knife blade. The white areas can be scratched, but you really have to work at it. The white areas are not waxy; they feel more like dried clay, but clay would scratch much easier. I found nothing conclusive on-line. Just wondering what it may be.

 

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[rockpassion]

that looks like a flint nodule, goolge it.

 

[Blackfoot58]

that looks like a flint nodule, goolge it

Yes it does. Thank you. I knew flint & chert were the same and that jasper is the gemologist term for it. But I never came across the flint nodule explanation.
I only struggle with the fact that the lighter color scratches more easily.

 

[rockpassion]

Yes it does. Thank you. I knew flint & chert were the same and that jasper is the gemologist term for it. But I never came across the flint nodule explanation.
I only struggle with the fact that the lighter color scratches more easily.

the white is a calciumlimestone deposit because flint nodule are formed in limstone sediment/layeres. And when the limestone erodes away the flint nodules fall out and can still contain a calcium/limestone layer/crust

 

[Blackfoot58]

the white is a calciumlimestone deposit because flint nodule are formed in limstone sediment/layeres. And when the limestone erodes away the flint nodules fall out and can still contain a calcium/limestone layer/crust

That answers a lot. I appreciate the help. 👍🏼