On most isles, any isle with rocks! (I find Meadow Isle has a lot)
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you can find it on any prairie-based isles. answered by FriesiansForever
Any of the Lava Isles are where you can find obsidian chunks. There is no "best" place. Also, sometimes you can find them in the rock shops if another player has sold them recently.
Its in the GeneralStore on GlacierTon
On Horse Isle on the pathway you use when walking to Hoof Isle
I think you can find shining copper in the Ganache Mine.