[Nhrockhounds (OP)]

IMG_20170926_165733.thumb.jpg.a291dd60e232c8cfb89a1eb2fff42665.jpg (54.78 kB . 563x750 - viewed 4538 times)
IMG_20170926_165835.thumb.jpg.2c8faec9902e552928ca0aaeda4943e2.jpg (63.87 kB . 563x750 - viewed 4585 times)
Can I get some assistance identifying these 2 rocks?

I think they are the same mineral, but have no clue what rock/mineral they are...

What is the name of this rock/mineral please?

[chris]

Please tell us where you found them, in what context and any other information that make help us to make a diagnosis.

[Nhrockhounds (OP)]

Please tell us where you found them, in what context and any other information that make help us to make a diagnosis.

Thanks!
They were found in Plymouth, NH in the forest in a brook that runs through glacial gravel deposits from the last ice age.

[RD]

Possibly crinoid fossils ?

Silurian New Hampshire was home to creatures like brachiopods, bryozoans, corals, crinoids, and trilobites ...

https://en.wikipedia.org/wiki/Paleontology_in_New_Hampshire#Prehistory

[chris]

What a fabulous photograph, @RD

[Bill S]

What a fabulous photograph,

What a fabulous specimen!   Must be an emoticon for envy, somewhere,

[RD]

Just to make it clear: I haven't enhanced the OP's photo to bring out detail,
I've just superimposed a crinoid-fossil image on top of part of it, for comparison ...