🔎 UNIDENTIFIED What is this black crystalized line around this boulder?

[Alienboss]

Does this mean these is something inside this boulder? Boulder is probably 200 pounds.

 

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[Bucket Lister]

Does this mean these is something inside this boulder? Boulder is probably 200 pounds.

"something inside"... ?

More likely it means that the "boulder" was cracked or split at one time, and ground water with dissolved minerals seeped in and crystalized/solidified over time. IME, that thin vein goes all the way through at the same thickness.

I doubt it's a geode.

 

[ConceptualizedNetherlandr]

Bust off a fresh surface and see what the vein material is made of. Mineralization?

 

[blauer]

Without better information or pictures ... Dirt in a crack (I never thought I would write those words).

 

[tamrock]

It's some kind of mineralization that formed in a cracked rock formation long before it became a boulder. My wild guess it be manganese in the crack. No one can ever say for sure with only a picture.

 

[Moesia]

Does this mean these is something inside this boulder? Boulder is probably 200 pounds.

No.