From the Super Mario Wiki
Rock Candy is a damage-dealing item found in Super Mario RPG: Legend of the Seven Stars. Mario and his friends can find this item in certain dungeons as inside the Pipes of Bean Valley or inside Bowser's Keep. They can also be "won" from Mushroom Boy or earned from defeating Jawfuls, Tub-O-Troopas, Puppoxes and Machine Made Yaridoviches. When used, the Rock Candy performs a shining star storm, hitting all enemies for 200 points of damage. If the user has the Quartz Charm equipped, the damage output is raised to 300.
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