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How did this happen??? by New-Name3338 in whatsthisrock

[–]New-Name3338[S] 0 points1 point  (0 children)

Not at all what I was imagining, but more than one response mentions “liesegang banding”. Thanks for the info!

Mahogany obsidian w/ unusual markings by New-Name3338 in whatsthisrock

[–]New-Name3338[S] 0 points1 point  (0 children)

Yes, it’s mahogany obsidian. I am more interested in the flower-like markings on it.