Newbie needs mineral I.D. help.

[Jess jack]

First timer, I have these mineral chunks with crystal structures and gemstones inside that are black and yellow. These are from my grandpa that lived in Utah in the 30's and mined and collected. They look like layered hot springs or?! HELP?

Thanks in advance for any ideas.

 

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[islamoradamark]

Welcome to Treasurenet

 

[How Lucky]

Calcite layered deposits. They form in many different ways.