Help with this one please

[crystalraye0379]

We went camping this past weekend at Mt Princeton near Salida, CO. We were looking for rocks/gems in the river and I found this. Glass? Sea glass? Some sort of obsidian? There’s a yellow mineral or something in there that stands out. Looks almost opaque black until light shines through it. Then it’s a olive greenish yellowish color. Very interested to find out. Pics and lighting aren’t the greatest. I Tried to take pics before I got home to better light cause I didn’t want to wait to post it lol.

 

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[smokeythecat]

It is a nodule of obsidian. Nice.

 

[DDancer]

What smokey says Sometimes called Apache tears. Good find.

 

[ToddsPoint]

It appears to me to have a fossil shell imprint on one side. No fossils in obsidian. If it is a shell fossil, it would be some type of flint or chert. Gary

 

[Eu_citzen]

It appears to me to have a fossil shell imprint on one side. No fossils in obsidian. If it is a shell fossil, it would be some type of flint or chert. Gary

A good example of Conchoidal fracture.

Conchoidal Fracture

 

[IAMZIM]

A good example of Conchoidal fracture.

Conchoidal Fracture

Exactly what I was about to say. In this case it has been stream tumbled after being fractured giving it the smooth appearance. It would be impossible for there to be a fossil in obsidian, as obsidian when it is formed is so hot it would burn away any trace of anything living. Obsidian is basically cooled molten lava.