cool fossilized shell i found, no clue what it is
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someone more specialize will need to confirm this but this looks like a steinkern to me (basically when the organism in the shell dies, sediment may seep in and create a mold of the inside), it looks more like sediment than an actual shell.
\nSteinkern is correct and it formed as you described, except the shell acts as the mold and the hardened sediment that remains after the shell dissolves away is called a cast.
\nI can confirm because I have a collection of them
\n\ud83e\udee1
\nDefinitely looks like some type of gastropod! Awesome find ^
\nWhere did you find it?
\nThat\u2019s an omanyte
\n