concretion

Hi. I Found this mineral inside of a concretion. The minerals that I typically find inside the concretions local to my area are calcite and Aragonite. This is the only one I have ever opened that looks like this. Any ideas? Thank you. Location: Orange County, California

Years ago, a Spanish ship filled with silver treasure was found off the south coast of the Bahamas where I am staying. I have dived that site and found parts of the ship. Yesterday however, I believe I may have found a real gem! At first I thought it was an old bottle, but when I picked it up it...

I am new to treasure hunting. Found this in sticky clay of natural spring on S. Oregon coast. Has shiny outer shell and a smooth grain under loupe.I have looked in all rock, mineral and fossil pics I can find. Not magnetic. Any help is appreciated.

I could use any info identifying this rock. I've not seen veining like this before. Thanks

I've found quite a few Michigan Lightning Stones this year and finally got around to making some spheres. I really like this kind of stone.