Crystals

[Old Dude]

Hi all. Never posted in this forum before but was looking at a find today from a few years ago. Found this crystal formation in Northeastern Pennsylvania among coal mining discard rock. I know pyrite and iron is common with coal....can anyone tell me what the yellow is in this crystal? Thanks for any help.

 

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[chris rizin]

Could just be some iron staining or another mineral.. Pictures are kind of hard to see well enough for me.. Any local rock and gem shops or maybe a rock show in your area soon? I use some to help identify material.. Or even a school with a geology department..

 

[Jhaddad8]

Looks kind of like sulfur, do they have a rotten egg smell?

 

[Old Dude]

No rotten egg smell. Thanks for your replies.

 

[Eu_citzen]

Can also just be a yellowish clay.

 

[Cariboo5]

May be Calcite.....Try a small scratch and pour a bit of vingar on it. Calcite will fizz...