✅ SOLVED Rock Grains, like wood?

[Wishbone]

These were found in a creek in Southern BC, They all are smooth to the touch, with no sharp edges. I've learned that's from rolling down the creek or river. They are all shaped different, and are different colors. The thing they have in common is that they have grains? I made them wet so it's easier to see. Like a coffee table or something. What is this "graining" called please? And does it have any meaning to us miners?
Thank you.

 

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[BosnMate]

Before looking at the stones I though perhaps petrified wood, but I don't see the grain you are talking about. Petrified wood would have evidence of growth rings, grain something like that. Are you talking about granules of sparkly stuff

 

[lab rat]

Igneous or metamorphic rocks - I recommend a web search for Gneiss.

 

[Wishbone]

Do you see where the big rock is dark on the right, and then gets lighter to the left, that's where the graining is. I'll try to get better pictures, this is only my 2nd attempt at Lapidary Photography. And you know how models are, they're sooo moody...lol.
Thank you!

 

[huntsman53]

Possibly Agatized Wood.


Frank

 

[Wishbone]

I took lab rats advice and searched Gneiss on Google Images. I'd say he is right, but one thing was different then mine. Out of 30 or 40 images, only 3 were smooth like mine? All the other images had corners, or edges. I don't know if that means anything?

 

[Back-of-the-boat]

I took lab rats advice and searched Gneiss on Google Images. I'd say he is right, but one thing was different then mine. Out of 30 or 40 images, only 3 were smooth like mine? All the other images had corners, or edges. I don't know if that means anything?

The reason they are smooth is they have been eroded down over time. They look as though they might have been in a river?Tumbling along hitting other rocks will smooth out and give the edges roundness.

 

[Wishbone]

Yup, your right, it Gneiss. Thanks for teaching me what Gneiss is, and for your time!!