Need help with ID please.

[crystalraye0379]

Found in the Green River Formation Northwestern Colorado. Can anyone help with identifying what this may be? Thanks.

 

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[DDancer]

Hard to say crystal, try an acid test for carbonates and some hardness/streak testing. Does it feel heavy or light compaired to a simular stone? Overall it appears to be something simular to a concretion but it may be a nodule of something like calcite or barite.

 

[faribo]

Hard to say crystal, try an acid test for carbonates and some hardness/streak testing. Does it feel heavy or light compaired to a simular stone? Overall it appears to be something simular to a concretion but it may be a nodule of something like calcite or barite.

I agree. Could be onyx too.