It really depends on which circumstance you're looking for...
The first time the conch is blown when they first get on the island is page 18
"Ralph grasped the idea and hit the shell with air from his diaphragm. Immediately the thing sounded. A deep , harsh note boomed under the palms, spread through the intricacies of the forest and echoed back from the pink granite of the mountains."
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Piggy is holding the conch when he is hit by a boulder that Rodger rolled down at him, and the conch shatters on impact.
In my edition of the book the conch is destroyed on page 200: chapter eleven: Castle Rock.
At penis
It represents authority.
The conch shell.
Who said we don't need the conch anymore in the Lord of the flies
In the lord of the flies the symbol of authority is the pink cream colored conch shell