The word you're looking for is.... stone.
Coral?
geode
stone
Pebbles
the answer is........ stone!!
stone
The 5 letter word that means the opposite of big and has a short vowel sound is "small."
tui
warbler
One option is stone.
add a letter to mined ad get a word meaning cut to small pieces
dyne
Pulverize.
Atoll