"Thunderstone" is a word in ENGLISH

thunderstone ENGLISH
Definition:

A belemnite. See Belemnite.

thunderstone ENGLISH
Definition:

A thunderbolt, -- formerly believed to be a stone.

Few words of positivity

Every word the right one and exactly where it should be. That's basically the highest compliment I can give.

Gabrielle Zevin, The Storied Life of A.J. Fikry

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belemnite ENGLISH

A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, …

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guard ENGLISH

The fibrous sheath which covers the phragmacone of the Belemnites.

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phragmocone ENGLISH

The thin chambered shell attached to the anterior end of a belemnite.

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proostracum ENGLISH

The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See …

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thunderbolt ENGLISH

A belemnite, or thunderstone.

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